feat(daemon): RPC 统一 envelope、命名空间分发与只读方法

阶段 1a 的协议地基（承接错误码模型）：

- 统一 envelope：所有响应装入 JSON-RPC 2.0 result 的
  { ok, status, data, error, request_id }；error 用 bat_core::ApiError
  （含 BAT-ERR 码/kind/domain/location/retryable）。传输层解析失败仍走
  JSON-RPC 顶层 error。request_id 为 req-<pid>-<seq>。
- 命名空间分发：方法改用国际惯例 <namespace>.<action>；daemon.* 为规范名，
  bat.* 保留为兼容别名（canonical_rpc_method 解析）。未知方法 → 700001，
  已规划未实现（resource.sync/verify、catalog.*/patch.*/unityfs.* 等）→ 700003。
- 只读方法：daemon.status/logs/stop/reload/refresh（迁移）、resource.state（新增，
  返回资源发布根 + 版本状态 + 上次同步结果）、task.status/task.list（任务库暂空，
  status → 700004，list → 空列表；执行器留待阶段 1b）。
- 客户端 daemon_rpc_call 解包 envelope（检查 ok、返回 data、把 error 转 Err），
  CLI 调用方零改动。

验证：新增分发/别名/envelope 单测（60 bin 测试全过）；真机起停 daemon 端到端确认
daemon.status/logs/resource.state/task.list 经 CLI 与裸 socket 均正确返回 envelope，
bat.* 别名生效，未知/未实现返回对应 BAT-ERR 码。

对应 issue #1（协议基础设施 + 最小只读方法集）。

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

infrastructure/src/bin/bat_official_sync.rs

@@ -1,4 +1,5 @@
 use bat_adapters::official::yostar_jp::PatchPlatform;
+use bat_core::{ApiError, ErrorCode};
 use bat_infrastructure::{
     gc_orphan_staging, lexical_absolute, open_append_file, read_file_no_symlink,
     read_version_state, redact_proxy_url, resolve_curl_proxy, validate_output_root,
@@ -602,11 +603,102 @@ struct DaemonRpcAck {
     force: Option<bool>,
 }
 
-const RPC_METHOD_STATUS: &str = "bat.status";
+// 规范方法名采用国际惯例的 `<namespace>.<action>`。`bat.*` 保留为向后兼容别名。
-const RPC_METHOD_STOP: &str = "bat.stop";
+const RPC_METHOD_STATUS: &str = "daemon.status";
-const RPC_METHOD_RELOAD: &str = "bat.reload";
+const RPC_METHOD_STOP: &str = "daemon.stop";
-const RPC_METHOD_REFRESH: &str = "bat.refresh";
+const RPC_METHOD_RELOAD: &str = "daemon.reload";
-const RPC_METHOD_LOGS: &str = "bat.logs";
+const RPC_METHOD_REFRESH: &str = "daemon.refresh";
+const RPC_METHOD_LOGS: &str = "daemon.logs";
+const RPC_METHOD_RESOURCE_STATE: &str = "resource.state";
+const RPC_METHOD_TASK_STATUS: &str = "task.status";
+const RPC_METHOD_TASK_LIST: &str = "task.list";
+
+/// 把 `bat.*` 兼容别名解析为规范的 `daemon.*` 方法名；其余原样返回。
+fn canonical_rpc_method(method: &str) -> &str {
+    match method {
+        "bat.status" => RPC_METHOD_STATUS,
+        "bat.stop" => RPC_METHOD_STOP,
+        "bat.reload" => RPC_METHOD_RELOAD,
+        "bat.refresh" => RPC_METHOD_REFRESH,
+        "bat.logs" => RPC_METHOD_LOGS,
+        other => other,
+    }
+}
+
+/// 判断方法是否属于已规划但尚未实现的命名空间/动作（返回 not_implemented 而非 unknown）。
+fn is_pending_rpc_method(method: &str) -> bool {
+    matches!(
+        method,
+        "resource.sync" | "resource.verify" | "task.create" | "task.cancel" | "task.logs"
+    ) || method.starts_with("catalog.")
+        || method.starts_with("patch.")
+        || method.starts_with("unityfs.")
+}
+
+/// RPC 应用层统一 envelope，装入 JSON-RPC 2.0 的 `result`。
+///
+/// 所有响应都带 `ok`/`status`/`data`/`error`/`request_id`；传输层错误（请求解析失败）
+/// 仍走 JSON-RPC 顶层 `error`。
+#[derive(Debug, Serialize)]
+struct RpcEnvelope {
+    ok: bool,
+    status: &'static str,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    data: Option<serde_json::Value>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    error: Option<ApiError>,
+    request_id: String,
+}
+
+/// 生成进程内唯一的 request_id（`req-<pid>-<seq>`）。
+fn next_request_id() -> String {
+    use std::sync::atomic::{AtomicU64, Ordering};
+    static COUNTER: AtomicU64 = AtomicU64::new(1);
+    format!(
+        "req-{}-{}",
+        std::process::id(),
+        COUNTER.fetch_add(1, Ordering::Relaxed)
+    )
+}
+
+fn rpc_envelope_ok(
+    request_id: String,
+    status: &'static str,
+    data: serde_json::Value,
+) -> RpcEnvelope {
+    RpcEnvelope {
+        ok: true,
+        status,
+        data: Some(data),
+        error: None,
+        request_id,
+    }
+}
+
+fn rpc_envelope_error(request_id: String, error: ApiError) -> RpcEnvelope {
+    RpcEnvelope {
+        ok: false,
+        status: "error",
+        data: None,
+        error: Some(error),
+        request_id,
+    }
+}
+
+/// 把内部 `anyhow::Result<Value>` 转成 envelope；成功为 ok，失败归为内部错误码。
+fn rpc_envelope_from_result(
+    request_id: String,
+    location: &'static str,
+    result: anyhow::Result<serde_json::Value>,
+) -> RpcEnvelope {
+    match result {
+        Ok(data) => rpc_envelope_ok(request_id, "ok", data),
+        Err(error) => rpc_envelope_error(
+            request_id,
+            ApiError::new(ErrorCode::INTERNAL, location, error.to_string()),
+        ),
+    }
+}
 
 fn record_daemon_status(
     enabled: bool,
@@ -1068,70 +1160,166 @@ fn handle_daemon_rpc_request(
     control: &DaemonControl,
 ) -> JsonRpcResponse {
     let id = request.id.clone();
-    let result: anyhow::Result<serde_json::Value> = match request.method.as_str() {
+    let request_id = next_request_id();
-        RPC_METHOD_STATUS => {
+    let envelope = dispatch_rpc_method(&request, state_dir, control, request_id);
-            let report = build_daemon_status_report(state_dir);
+    match serde_json::to_value(&envelope) {
-            report.and_then(|report| serde_json::to_value(report).map_err(anyhow::Error::from))
+        Ok(value) => json_rpc_result(id, value),
+        Err(error) => json_rpc_error(id, -32603, error.to_string()),
+    }
+}
+
+/// 命名空间分发：把请求路由到对应 handler，统一返回应用层 envelope。
+fn dispatch_rpc_method(
+    request: &JsonRpcRequest,
+    state_dir: &Path,
+    control: &DaemonControl,
+    request_id: String,
+) -> RpcEnvelope {
+    match canonical_rpc_method(&request.method) {
+        RPC_METHOD_STATUS => rpc_envelope_from_result(
+            request_id,
+            "daemon.status",
+            build_daemon_status_report(state_dir)
+                .and_then(|report| serde_json::to_value(report).map_err(anyhow::Error::from)),
+        ),
+        RPC_METHOD_LOGS => {
+            let tail = match rpc_tail_param(request.params.as_ref(), 200) {
+                Ok(tail) => tail,
+                Err(error) => {
+                    return rpc_envelope_error(
+                        request_id,
+                        ApiError::new(
+                            ErrorCode::RPC_INVALID_PARAMS,
+                            "daemon.logs",
+                            error.to_string(),
+                        ),
+                    )
+                }
+            };
+            rpc_envelope_from_result(
+                request_id,
+                "daemon.logs",
+                build_logs_report(state_dir, tail)
+                    .and_then(|report| serde_json::to_value(report).map_err(anyhow::Error::from)),
+            )
         }
         RPC_METHOD_STOP => {
             daemon_control_mark_stop_requested(control);
             let _ = update_daemon_state_only(state_dir, "stopping");
-            serde_json::to_value(DaemonRpcAck {
+            rpc_envelope_ok(
-                command: "stop",
+                request_id,
-                status: "accepted",
+                "accepted",
-                message: "后台停止请求已发送",
+                rpc_ack_value("stop", "后台停止请求已发送", state_dir, None),
-                state_dir: state_dir.to_path_buf(),
+            )
-                socket_path: daemon_socket_path(state_dir),
-                force: None,
-            })
-            .map_err(anyhow::Error::from)
         }
         RPC_METHOD_RELOAD => {
             daemon_control_request_reload(control);
-            serde_json::to_value(DaemonRpcAck {
+            rpc_envelope_ok(
-                command: "reload",
+                request_id,
-                status: "accepted",
+                "accepted",
-                message: "后台重新加载请求已发送；空闲时会立即唤醒，忙碌时会在当前轮结束后重新执行自动发现和强制刷新",
+                rpc_ack_value(
-                state_dir: state_dir.to_path_buf(),
+                    "reload",
-                socket_path: daemon_socket_path(state_dir),
+                    "后台重新加载请求已发送；空闲时会立即唤醒，忙碌时会在当前轮结束后重新执行自动发现和强制刷新",
-                force: Some(true),
+                    state_dir,
-            })
+                    Some(true),
-            .map_err(anyhow::Error::from)
+                ),
+            )
         }
         RPC_METHOD_REFRESH => {
             let force = rpc_bool_param(request.params.as_ref(), "force").unwrap_or(false);
             daemon_control_request_refresh(control, force);
-            serde_json::to_value(DaemonRpcAck {
+            let message = if force {
-                command: "refresh",
-                status: "accepted",
-                message: if force {
                 "后台强制刷新请求已发送；空闲时会立即唤醒，忙碌时会在当前轮结束后执行"
             } else {
                 "后台刷新检查请求已发送；空闲时会立即唤醒，忙碌时会在当前轮结束后执行"
-                },
+            };
+            rpc_envelope_ok(
+                request_id,
+                "accepted",
+                rpc_ack_value("refresh", message, state_dir, Some(force)),
+            )
+        }
+        RPC_METHOD_RESOURCE_STATE => rpc_envelope_from_result(
+            request_id,
+            "resource.state",
+            build_resource_state_report(state_dir),
+        ),
+        RPC_METHOD_TASK_STATUS => {
+            let task_id = request
+                .params
+                .as_ref()
+                .and_then(|params| params.get("task_id"))
+                .and_then(serde_json::Value::as_str)
+                .unwrap_or_default();
+            // 任务执行器尚未落地（阶段 1b）；任务库为空，任何 task_id 都不存在。
+            rpc_envelope_error(
+                request_id,
+                ApiError::new(
+                    ErrorCode::TASK_NOT_FOUND,
+                    "task.status",
+                    format!("任务不存在：{task_id}"),
+                ),
+            )
+        }
+        RPC_METHOD_TASK_LIST => {
+            rpc_envelope_ok(request_id, "ok", serde_json::json!({ "tasks": [] }))
+        }
+        pending if is_pending_rpc_method(pending) => rpc_envelope_error(
+            request_id,
+            ApiError::new(
+                ErrorCode::RPC_NOT_IMPLEMENTED,
+                "rpc.dispatch",
+                format!("方法尚未实现：{pending}"),
+            ),
+        ),
+        unknown => rpc_envelope_error(
+            request_id,
+            ApiError::new(
+                ErrorCode::RPC_UNKNOWN_METHOD,
+                "rpc.dispatch",
+                format!("未知 RPC 方法：{unknown}"),
+            ),
+        ),
+    }
+}
+
+fn rpc_ack_value(
+    command: &'static str,
+    message: &'static str,
+    state_dir: &Path,
+    force: Option<bool>,
+) -> serde_json::Value {
+    serde_json::to_value(DaemonRpcAck {
+        command,
+        status: "accepted",
+        message,
         state_dir: state_dir.to_path_buf(),
         socket_path: daemon_socket_path(state_dir),
-                force: Some(force),
+        force,
     })
-            .map_err(anyhow::Error::from)
+    .unwrap_or(serde_json::Value::Null)
-        }
+}
-        RPC_METHOD_LOGS => {
-            let tail = match rpc_tail_param(request.params.as_ref(), 200) {
-                Ok(tail) => tail,
-                Err(error) => return json_rpc_error(id, -32602, error.to_string()),
-            };
-            let report = build_logs_report(state_dir, tail);
-            report.and_then(|report| serde_json::to_value(report).map_err(anyhow::Error::from))
-        }
-        _ => {
-            return json_rpc_error(id, -32601, format!("未知后台 RPC 方法：{}", request.method));
-        }
-    };
 
-    match result {
+/// 构建 `resource.state` 数据：资源发布根、版本状态、上次同步结果。
-        Ok(value) => json_rpc_result(id, value),
+fn build_resource_state_report(state_dir: &Path) -> anyhow::Result<serde_json::Value> {
-        Err(error) => json_rpc_error(id, -32603, error.to_string()),
+    let status_file = read_daemon_status_file(&daemon_status_path(state_dir))?;
-    }
+    let resource_output_root = status_file
+        .as_ref()
+        .map(|status| status.resource_output_root.clone());
+    let version_state = resource_output_root
+        .as_ref()
+        .map(|root| root.join("official-version-state.json"))
+        .and_then(|path| read_version_state(&path).ok().flatten());
+    Ok(serde_json::json!({
+        "resource_output_root": resource_output_root,
+        "version_state": version_state,
+        "last_update_status": status_file
+            .as_ref()
+            .and_then(|status| status.last_update_status.clone()),
+        "last_success_unix_seconds": status_file
+            .as_ref()
+            .and_then(|status| status.last_success_unix_seconds),
+    }))
 }
 
 #[cfg(unix)]
@@ -1211,13 +1399,38 @@ fn daemon_rpc_call(
     let response: JsonRpcClientResponse = serde_json::from_str(&line)?;
     if let Some(error) = response.error {
         return Err(anyhow::anyhow!(
-            "后台 RPC {} 失败：{} ({})",
+            "后台 RPC {} 传输层失败：{} ({})",
             method,
             error.message,
             error.code
         ));
     }
-    Ok(response.result.unwrap_or(serde_json::Value::Null))
+    // 解包应用层 envelope：检查 ok，成功返回 data，失败把 envelope.error 转为 Err。
+    let envelope = response
+        .result
+        .ok_or_else(|| anyhow::anyhow!("后台 RPC {method} 未返回 result"))?;
+    let ok = envelope
+        .get("ok")
+        .and_then(serde_json::Value::as_bool)
+        .unwrap_or(false);
+    if !ok {
+        let error = envelope.get("error");
+        let code = error
+            .and_then(|error| error.get("code"))
+            .and_then(serde_json::Value::as_str)
+            .unwrap_or("");
+        let message = error
+            .and_then(|error| error.get("message"))
+            .and_then(serde_json::Value::as_str)
+            .unwrap_or("未知错误");
+        return Err(anyhow::anyhow!(
+            "后台 RPC {method} 失败：[{code}] {message}"
+        ));
+    }
+    Ok(envelope
+        .get("data")
+        .cloned()
+        .unwrap_or(serde_json::Value::Null))
 }
 
 #[cfg(not(unix))]
@@ -4668,6 +4881,97 @@ mod tests {
         assert!(error.to_string().contains(PROXY_URL_ENV_VAR));
     }
 
+    fn rpc_request(method: &str, params: Option<serde_json::Value>) -> JsonRpcRequest {
+        JsonRpcRequest {
+            jsonrpc: Some("2.0".to_string()),
+            id: Some(serde_json::json!(1)),
+            method: method.to_string(),
+            params,
+        }
+    }
+
+    #[test]
+    fn canonical_rpc_method_resolves_aliases() {
+        assert_eq!(canonical_rpc_method("bat.status"), RPC_METHOD_STATUS);
+        assert_eq!(canonical_rpc_method("bat.refresh"), RPC_METHOD_REFRESH);
+        assert_eq!(canonical_rpc_method("daemon.status"), RPC_METHOD_STATUS);
+        assert_eq!(canonical_rpc_method("resource.state"), "resource.state");
+        assert_eq!(canonical_rpc_method("unknown.method"), "unknown.method");
+    }
+
+    #[test]
+    fn is_pending_rpc_method_covers_planned_namespaces() {
+        assert!(is_pending_rpc_method("resource.sync"));
+        assert!(is_pending_rpc_method("resource.verify"));
+        assert!(is_pending_rpc_method("catalog.status"));
+        assert!(is_pending_rpc_method("patch.apply"));
+        assert!(is_pending_rpc_method("unityfs.inspect"));
+        assert!(!is_pending_rpc_method("daemon.status"));
+        assert!(!is_pending_rpc_method("resource.state"));
+    }
+
+    #[test]
+    fn dispatch_unknown_method_returns_unknown_error_envelope() {
+        let temp = tempfile::TempDir::new().unwrap();
+        let control = new_daemon_control();
+        let envelope = dispatch_rpc_method(
+            &rpc_request("nope.nope", None),
+            temp.path(),
+            &control,
+            "req-test-1".to_string(),
+        );
+        let value = serde_json::to_value(&envelope).unwrap();
+        assert_eq!(value["ok"], false);
+        assert_eq!(value["error"]["code"], "BAT-ERR-700001");
+        assert_eq!(value["request_id"], "req-test-1");
+    }
+
+    #[test]
+    fn dispatch_pending_method_returns_not_implemented_envelope() {
+        let temp = tempfile::TempDir::new().unwrap();
+        let control = new_daemon_control();
+        let envelope = dispatch_rpc_method(
+            &rpc_request("resource.sync", None),
+            temp.path(),
+            &control,
+            "req-test-2".to_string(),
+        );
+        let value = serde_json::to_value(&envelope).unwrap();
+        assert_eq!(value["ok"], false);
+        assert_eq!(value["error"]["code"], "BAT-ERR-700003");
+    }
+
+    #[test]
+    fn dispatch_task_list_returns_empty_ok_envelope() {
+        let temp = tempfile::TempDir::new().unwrap();
+        let control = new_daemon_control();
+        let envelope = dispatch_rpc_method(
+            &rpc_request("task.list", None),
+            temp.path(),
+            &control,
+            "req-test-3".to_string(),
+        );
+        let value = serde_json::to_value(&envelope).unwrap();
+        assert_eq!(value["ok"], true);
+        assert_eq!(value["status"], "ok");
+        assert_eq!(value["data"]["tasks"], serde_json::json!([]));
+    }
+
+    #[test]
+    fn dispatch_task_status_reports_task_not_found() {
+        let temp = tempfile::TempDir::new().unwrap();
+        let control = new_daemon_control();
+        let envelope = dispatch_rpc_method(
+            &rpc_request("task.status", Some(serde_json::json!({ "task_id": "abc" }))),
+            temp.path(),
+            &control,
+            "req-test-4".to_string(),
+        );
+        let value = serde_json::to_value(&envelope).unwrap();
+        assert_eq!(value["ok"], false);
+        assert_eq!(value["error"]["code"], "BAT-ERR-700004");
+    }
+
     #[test]
     fn parses_explicit_watch_error_retry_interval() {
         let options =
@@ -4873,7 +5177,9 @@ mod tests {
             "params": { "force": true }
         }))
         .unwrap();
-        assert_eq!(request.method, RPC_METHOD_REFRESH);
+        // bat.* 是兼容别名，解析为规范的 daemon.* 方法名。
+        assert_eq!(request.method, "bat.refresh");
+        assert_eq!(canonical_rpc_method(&request.method), RPC_METHOD_REFRESH);
         assert_eq!(rpc_bool_param(request.params.as_ref(), "force"), Some(true));
 
         let response = json_rpc_result(