feat: 添加 RustDesk 协议支持和项目文档

- 新增 RustDesk 模块，支持与 RustDesk 客户端连接
  - 实现会合服务器协议和 P2P 连接
  - 支持 NaCl 加密和密钥交换
  - 添加视频帧和 HID 事件适配器
- 添加 Protobuf 协议定义 (message.proto, rendezvous.proto)
- 新增完整项目文档
  - 各功能模块文档 (video, hid, msd, otg, webrtc 等)
  - hwcodec 和 RustDesk 协议技术报告
  - 系统架构和技术栈文档
- 更新 Web 前端 RustDesk 配置界面和 API

docs/modules/config.md

@@ -0,0 +1,297 @@
+# Config 模块文档
+
+## 1. 模块概述
+
+Config 模块提供配置管理功能，所有配置存储在 SQLite 数据库中。
+
+### 1.1 主要功能
+
+- SQLite 配置存储
+- 类型安全的配置结构
+- 热重载支持
+- TypeScript 类型生成
+
+### 1.2 文件结构
+
+```
+src/config/
+├── mod.rs              # 模块导出
+├── schema.rs           # 配置结构定义 (12KB)
+└── store.rs            # SQLite 存储 (8KB)
+```
+
+---
+
+## 2. 核心组件
+
+### 2.1 ConfigStore (store.rs)
+
+```rust
+pub struct ConfigStore {
+    db: Pool<Sqlite>,
+}
+
+impl ConfigStore {
+    /// 创建存储
+    pub async fn new(db_path: &Path) -> Result<Self>;
+
+    /// 获取完整配置
+    pub async fn get_config(&self) -> Result<AppConfig>;
+
+    /// 更新配置
+    pub async fn update_config(&self, config: &AppConfig) -> Result<()>;
+
+    /// 获取单个配置项
+    pub async fn get<T: DeserializeOwned>(&self, key: &str) -> Result<Option<T>>;
+
+    /// 设置单个配置项
+    pub async fn set<T: Serialize>(&self, key: &str, value: &T) -> Result<()>;
+
+    /// 删除配置项
+    pub async fn delete(&self, key: &str) -> Result<()>;
+
+    /// 重置为默认
+    pub async fn reset_to_default(&self) -> Result<()>;
+}
+```
+
+### 2.2 AppConfig (schema.rs)
+
+```rust
+#[derive(Serialize, Deserialize, Default)]
+#[typeshare]
+pub struct AppConfig {
+    /// 视频配置
+    pub video: VideoConfig,
+
+    /// 流配置
+    pub stream: StreamConfig,
+
+    /// HID 配置
+    pub hid: HidConfig,
+
+    /// MSD 配置
+    pub msd: MsdConfig,
+
+    /// ATX 配置
+    pub atx: AtxConfig,
+
+    /// 音频配置
+    pub audio: AudioConfig,
+
+    /// 认证配置
+    pub auth: AuthConfig,
+
+    /// Web 配置
+    pub web: WebConfig,
+
+    /// RustDesk 配置
+    pub rustdesk: RustDeskConfig,
+
+    /// 扩展配置
+    pub extensions: ExtensionsConfig,
+}
+```
+
+### 2.3 各模块配置
+
+```rust
+#[derive(Serialize, Deserialize)]
+#[typeshare]
+pub struct VideoConfig {
+    pub device: Option<String>,
+    pub format: Option<String>,
+    pub width: u32,
+    pub height: u32,
+    pub fps: u32,
+    pub quality: u32,
+}
+
+#[derive(Serialize, Deserialize)]
+#[typeshare]
+pub struct StreamConfig {
+    pub mode: StreamMode,
+    pub bitrate_kbps: u32,
+    pub gop_size: u32,
+    pub encoder: EncoderType,
+    pub stun_server: Option<String>,
+    pub turn_server: Option<String>,
+    pub turn_username: Option<String>,
+    pub turn_password: Option<String>,
+}
+
+#[derive(Serialize, Deserialize)]
+#[typeshare]
+pub struct HidConfig {
+    pub backend: HidBackendType,
+    pub ch9329_device: Option<String>,
+    pub ch9329_baud_rate: Option<u32>,
+    pub default_mouse_mode: MouseMode,
+}
+
+// ... 其他配置结构
+```
+
+---
+
+## 3. TypeScript 类型生成
+
+使用 `#[typeshare]` 属性自动生成 TypeScript 类型：
+
+```rust
+#[derive(Serialize, Deserialize)]
+#[typeshare]
+pub struct VideoConfig {
+    pub device: Option<String>,
+    pub width: u32,
+    pub height: u32,
+}
+```
+
+生成的 TypeScript：
+
+```typescript
+export interface VideoConfig {
+    device?: string;
+    width: number;
+    height: number;
+}
+```
+
+生成命令：
+
+```bash
+./scripts/generate-types.sh
+# 或
+typeshare src --lang=typescript --output-file=web/src/types/generated.ts
+```
+
+---
+
+## 4. API 端点
+
+| 端点 | 方法 | 权限 | 描述 |
+|------|------|------|------|
+| `/api/config` | GET | Admin | 获取完整配置 |
+| `/api/config` | PATCH | Admin | 更新配置 |
+| `/api/config/video` | GET | Admin | 获取视频配置 |
+| `/api/config/video` | PATCH | Admin | 更新视频配置 |
+| `/api/config/stream` | GET | Admin | 获取流配置 |
+| `/api/config/stream` | PATCH | Admin | 更新流配置 |
+| `/api/config/hid` | GET | Admin | 获取 HID 配置 |
+| `/api/config/hid` | PATCH | Admin | 更新 HID 配置 |
+| `/api/config/reset` | POST | Admin | 重置为默认 |
+
+### 响应格式
+
+```json
+// GET /api/config/video
+{
+    "device": "/dev/video0",
+    "format": "MJPEG",
+    "width": 1920,
+    "height": 1080,
+    "fps": 30,
+    "quality": 80
+}
+
+// PATCH /api/config/video
+// Request:
+{
+    "width": 1280,
+    "height": 720
+}
+
+// Response: 更新后的完整配置
+```
+
+---
+
+## 5. 配置热重载
+
+配置更改后自动重载相关组件：
+
+```rust
+// 更新配置
+config_store.update_config(&new_config).await?;
+
+// 发布配置变更事件
+events.publish(SystemEvent::ConfigChanged {
+    section: "video".to_string(),
+});
+
+// 各组件监听事件并重载
+// VideoStreamManager::on_config_changed()
+// HidController::reload()
+// etc.
+```
+
+---
+
+## 6. 数据库结构
+
+```sql
+CREATE TABLE IF NOT EXISTS config (
+    key TEXT PRIMARY KEY,
+    value TEXT NOT NULL,
+    updated_at TEXT NOT NULL
+);
+```
+
+配置以 JSON 格式存储：
+
+```
+key: "app_config"
+value: { "video": {...}, "hid": {...}, ... }
+```
+
+---
+
+## 7. 使用示例
+
+```rust
+// 获取配置
+let config = config_store.get_config().await?;
+println!("Video device: {:?}", config.video.device);
+
+// 更新配置
+let mut config = config_store.get_config().await?;
+config.video.width = 1280;
+config.video.height = 720;
+config_store.update_config(&config).await?;
+
+// 获取单个配置项
+let video: Option<VideoConfig> = config_store.get("video").await?;
+
+// 设置单个配置项
+config_store.set("video", &video_config).await?;
+```
+
+---
+
+## 8. 默认配置
+
+```rust
+impl Default for AppConfig {
+    fn default() -> Self {
+        Self {
+            video: VideoConfig {
+                device: None,
+                format: None,
+                width: 1920,
+                height: 1080,
+                fps: 30,
+                quality: 80,
+            },
+            stream: StreamConfig {
+                mode: StreamMode::Mjpeg,
+                bitrate_kbps: 2000,
+                gop_size: 60,
+                encoder: EncoderType::H264,
+                ..Default::default()
+            },
+            // ...
+        }
+    }
+}
+```