Phase 2.7完成：文件浏览模块完善（SQLite查询 + Tree展示）

Phase 2.7.1成果：
- 实现SQLite数据库查询（file_registry/file_nodes表）
- get_tree()：构建完整虚拟Tree结构
- list_files()：列出文件节点
- search_files()：文件名模糊搜索
- download_file()：查询物理文件路径
- build_tree()：递归构建Tree辅助函数

Phase 2.7.2成果：
- Element Plus Tree组件集成
- 双虚拟目录切换（中文/英文）
- 文件节点点击打开功能
- 文件大小格式化显示（KB/MB/GB）
- 文件夹/文件图标区分

技术实现：
- 添加rusqlite依赖到Cargo.toml
- 修复Tauri features配置
- Home.vue完整Tree展示UI
- 编译成功（8警告，0错误）

状态：Phase 2总进度98%完成

markbase-tauri/src-tauri/Cargo.lock

@@ -637,15 +637,6 @@ dependencies = [
  "subtle",
 ]
 
-[[package]]
-name = "dirs"
-version = "5.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "44c45a9d03d6676652bcb5e724c7e988de1acad23a711b5217ab9cbecbec2225"
-dependencies = [
- "dirs-sys",
-]
-
 [[package]]
 name = "dirs-next"
 version = "2.0.0"
@@ -656,18 +647,6 @@ dependencies = [
  "dirs-sys-next",
 ]
 
-[[package]]
-name = "dirs-sys"
-version = "0.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520f05a5cbd335fae5a99ff7a6ab8627577660ee5cfd6a94a6a929b52ff0321c"
-dependencies = [
- "libc",
- "option-ext",
- "redox_users",
- "windows-sys 0.48.0",
-]
-
 [[package]]
 name = "dirs-sys-next"
 version = "0.1.2"
@@ -800,6 +779,18 @@ version = "2.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0206175f82b8d6bf6652ff7d71a1e27fd2e4efde587fd368662814d6ec1d9ce0"
 
+[[package]]
+name = "fallible-iterator"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2acce4a10f12dc2fb14a218589d4f1f62ef011b2d0cc4b3cb1bba8e94da14649"
+
+[[package]]
+name = "fallible-streaming-iterator"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7360491ce676a36bf9bb3c56c1aa791658183a54d2744120f27285738d90465a"
+
 [[package]]
 name = "fastrand"
 version = "2.4.1"
@@ -1993,7 +1984,7 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "chrono",
- "dirs",
+ "rusqlite",
  "serde",
  "serde_json",
  "sqlx",
@@ -2336,12 +2327,6 @@ dependencies = [
  "vcpkg",
 ]
 
-[[package]]
-name = "option-ext"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "04744f49eae99ab78e0d5c0b603ab218f515ea8cfe5a456d7629ad883a3b6e7d"
-
 [[package]]
 name = "os_pipe"
 version = "1.2.3"
@@ -2992,6 +2977,20 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "rusqlite"
+version = "0.30.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a78046161564f5e7cd9008aff3b2990b3850dc8e0349119b98e8f251e099f24d"
+dependencies = [
+ "bitflags 2.13.0",
+ "fallible-iterator",
+ "fallible-streaming-iterator",
+ "hashlink",
+ "libsqlite3-sys",
+ "smallvec",
+]
+
 [[package]]
 name = "rustc_version"
 version = "0.4.1"