feat(dev-server): 添加开发模式 HTTP/WebSocket 服务器

功能:
- 创建 dev_server.rs 模块，提供 HTTP/WebSocket API
- 使用 feature flag \dev-server\ 控制编译
- 仅绑定 localhost:50051，安全限制 CORS
- 生产构建不包含此模块

使用方式:
- pnpm tauri:dev:web - 启动带开发服务器的 Tauri
- pnpm tauri:dev - 常规开发模式（无服务器）

安全:
- 仅 localhost 绑定
- CORS 限制为 Vite 开发端口
- 通过 feature flag 完全移除生产代码

target/.rustc_info.json

@@ -1 +1 @@
-{"rustc_fingerprint":5915500824126575890,"outputs":{"7971740275564407648":{"success":true,"status":"","code":0,"stdout":"___.exe\nlib___.rlib\n___.dll\n___.dll\n___.lib\n___.dll\nC:\\Users\\szend\\.rustup\\toolchains\\stable-x86_64-pc-windows-msvc\npacked\n___\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_abi=\"\"\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"msvc\"\ntarget_family=\"windows\"\ntarget_feature=\"cmpxchg16b\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_feature=\"sse3\"\ntarget_has_atomic=\"128\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_os=\"windows\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"pc\"\nwindows\n","stderr":""},"17747080675513052775":{"success":true,"status":"","code":0,"stdout":"rustc 1.93.1 (01f6ddf75 2026-02-11)\nbinary: rustc\ncommit-hash: 01f6ddf7588f42ae2d7eb0a2f21d44e8e96674cf\ncommit-date: 2026-02-11\nhost: x86_64-pc-windows-msvc\nrelease: 1.93.1\nLLVM version: 21.1.8\n","stderr":""}},"successes":{}}
+{"rustc_fingerprint":5915500824126575890,"outputs":{"17747080675513052775":{"success":true,"status":"","code":0,"stdout":"rustc 1.93.1 (01f6ddf75 2026-02-11)\nbinary: rustc\ncommit-hash: 01f6ddf7588f42ae2d7eb0a2f21d44e8e96674cf\ncommit-date: 2026-02-11\nhost: x86_64-pc-windows-msvc\nrelease: 1.93.1\nLLVM version: 21.1.8\n","stderr":""},"7971740275564407648":{"success":true,"status":"","code":0,"stdout":"___.exe\nlib___.rlib\n___.dll\n___.dll\n___.lib\n___.dll\nC:\\Users\\szend\\.rustup\\toolchains\\stable-x86_64-pc-windows-msvc\npacked\n___\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_abi=\"\"\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"msvc\"\ntarget_family=\"windows\"\ntarget_feature=\"cmpxchg16b\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_feature=\"sse3\"\ntarget_has_atomic=\"128\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_os=\"windows\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"pc\"\nwindows\n","stderr":""}},"successes":{}}