chore: establish development baseline

crates/bat-patch/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "bat-patch"
+version.workspace = true
+edition.workspace = true
+authors.workspace = true
+license.workspace = true
+
+[dependencies]
+anyhow.workspace = true
+thiserror.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+blake3.workspace = true
+
+# Binary diff/patch
+bsdiff = "0.2"
+
+# JSON patch
+json-patch = "4.2"
+
+[dev-dependencies]
+tempfile = "3.14"

crates/bat-patch/src/binary.rs

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+//! Binary Patch 模块占位
+
+/// Binary Patch 应用（待实现）
+pub fn apply_patch(_old: &[u8], _patch: &[u8]) -> crate::Result<Vec<u8>> {
+    Ok(Vec::new())
+}

crates/bat-patch/src/error.rs

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+//! Patch 错误类型定义
+
+use thiserror::Error;
+
+/// Patch 错误类型
+#[derive(Error, Debug)]
+pub enum PatchError {
+    /// IO 错误
+    #[error("IO error: {0}")]
+    Io(#[from] std::io::Error),
+
+    /// Patch 应用失败
+    #[error("Patch apply failed: {0}")]
+    ApplyFailed(String),
+
+    /// 其他错误
+    #[error(transparent)]
+    Other(#[from] anyhow::Error),
+}
+
+/// Patch Result 类型
+pub type Result<T> = std::result::Result<T, PatchError>;

crates/bat-patch/src/json.rs

@@ -0,0 +1,6 @@
+//! JSON Patch 模块占位
+
+/// JSON Patch 应用（待实现）
+pub fn apply_json_patch(_doc: &str, _patch: &str) -> crate::Result<String> {
+    Ok(String::new())
+}

crates/bat-patch/src/lib.rs

@@ -0,0 +1,21 @@
+//! # BAT Patch
+//!
+//! Patch 引擎核心实现
+//!
+//! 支持：
+//! - Binary Diff/Patch
+//! - JSON Patch
+//! - Rollback
+//! - Integrity Check
+
+#![warn(missing_docs)]
+#![warn(clippy::all)]
+
+pub mod error;
+pub mod binary;
+pub mod json;
+
+pub use error::{PatchError, Result};
+
+/// Patch 引擎版本号
+pub const VERSION: &str = env!("CARGO_PKG_VERSION");