Phase 3完成：FUSE完整重构以支持fuse-t

核心成果：
- fuse-t库成功纳入项目（build.rs + Cargo.toml）
- fuse-backend-rs API完整实现（270行代码）
- FileSystem trait完整重写（lookup/getattr/read/readdir/open/release/opendir/releasedir/statfs）
- ZeroCopyWriter API正确集成（write_from方法）
- 服务循环正确实现（get_request + handle_message）

技术实现：
- 依赖：fuse-backend-rs（fusedev + fuse-t features）
- 链接：fuse-t库（pkg-config + DiskArbitration framework）
- 数据库：find_node_id_by_parent方法新增
- API：DirEntry/Entry/stat64正确使用
- 服务：FuseSession/FuseChannel正确集成

编译状态：
- 8警告，0错误
- 成功编译markbase-fuse库和main程序

状态：Phase 3完整实施完成

markbase-fuse/Cargo.toml

@@ -18,10 +18,11 @@ path = "src/lib.rs"
 anyhow = "1"
 clap = { version = "4", features = ["derive"] }
 filetree = { path = "../filetree" }
-fuse = "0.3.1"
+fuse-backend-rs = { path = "../fuse-backend-rs-fork", features = ["fusedev", "fuse-t"] }
 libc = "0.2"
 log = "0.4"
 rusqlite = { version = "0.32", features = ["bundled"] }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 time = "0.3"
+vm-memory = "0.17"