feat(bat): 完善工作流调度与 dashboard RPC

补全资源拉取、解析、翻译、重打包和本地化发布命令，支持单次、限定次数与周期调度。移除 TUI 计划并通过 schedule.* RPC 暴露给 bat-api dashboard。

Closes #43

internal/backendrpc/client_test.go

@@ -252,6 +252,52 @@ func TestResourceListSendsPagination(t *testing.T) {
 	}
 }
 
+func TestScheduleUpdateSendsMutationParams(t *testing.T) {
+	every := uint64(3600)
+	count := uint64(4)
+	enabled := true
+	client := newTestClient(t, func(t *testing.T, req testRequest) testResponse {
+		if req.Method != "schedule.update" {
+			t.Fatalf("method = %s", req.Method)
+		}
+		var params ScheduleMutationParams
+		if err := json.Unmarshal(req.Params, &params); err != nil {
+			t.Fatalf("decode params: %v", err)
+		}
+		if params.ID != "nightly-pull" || params.Group != "res" || params.Action != "pull" ||
+			params.EverySeconds == nil || *params.EverySeconds != every ||
+			params.Count == nil || *params.Count != count || params.Enabled == nil || !*params.Enabled {
+			t.Fatalf("params = %#v", params)
+		}
+		return testResponse{
+			Result: testEnvelope{
+				OK:        true,
+				Status:    "ok",
+				RequestID: "req-test-schedule",
+				Data: map[string]any{
+					"command": "schedule-update",
+					"status":  "updated",
+				},
+			},
+		}
+	})
+
+	raw, err := client.ScheduleUpdate(context.Background(), ScheduleMutationParams{
+		ID:           "nightly-pull",
+		Group:        "res",
+		Action:       "pull",
+		EverySeconds: &every,
+		Count:        &count,
+		Enabled:      &enabled,
+	})
+	if err != nil {
+		t.Fatalf("ScheduleUpdate error: %v", err)
+	}
+	if !json.Valid(raw) {
+		t.Fatalf("invalid raw JSON: %s", string(raw))
+	}
+}
+
 func TestApplicationErrorReturnsAPIError(t *testing.T) {
 	client := newTestClient(t, func(t *testing.T, req testRequest) testResponse {
 		if req.Method != "task.status" {