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

src/web/handlers/config/rustdesk.rs

@@ -0,0 +1,142 @@
+//! RustDesk 配置 Handler
+
+use axum::{extract::State, Json};
+use std::sync::Arc;
+
+use crate::error::Result;
+use crate::rustdesk::config::RustDeskConfig;
+use crate::state::AppState;
+
+use super::apply::apply_rustdesk_config;
+use super::types::RustDeskConfigUpdate;
+
+/// RustDesk 配置响应（隐藏敏感信息）
+#[derive(Debug, serde::Serialize)]
+pub struct RustDeskConfigResponse {
+    pub enabled: bool,
+    pub rendezvous_server: String,
+    pub relay_server: Option<String>,
+    pub device_id: String,
+    /// 是否已设置密码
+    pub has_password: bool,
+    /// 是否已设置密钥对
+    pub has_keypair: bool,
+}
+
+impl From<&RustDeskConfig> for RustDeskConfigResponse {
+    fn from(config: &RustDeskConfig) -> Self {
+        Self {
+            enabled: config.enabled,
+            rendezvous_server: config.rendezvous_server.clone(),
+            relay_server: config.relay_server.clone(),
+            device_id: config.device_id.clone(),
+            has_password: !config.device_password.is_empty(),
+            has_keypair: config.public_key.is_some() && config.private_key.is_some(),
+        }
+    }
+}
+
+/// RustDesk 状态响应
+#[derive(Debug, serde::Serialize)]
+pub struct RustDeskStatusResponse {
+    pub config: RustDeskConfigResponse,
+    pub service_status: String,
+    pub rendezvous_status: Option<String>,
+}
+
+/// 获取 RustDesk 配置
+pub async fn get_rustdesk_config(State(state): State<Arc<AppState>>) -> Json<RustDeskConfigResponse> {
+    Json(RustDeskConfigResponse::from(&state.config.get().rustdesk))
+}
+
+/// 获取 RustDesk 完整状态（配置 + 服务状态）
+pub async fn get_rustdesk_status(State(state): State<Arc<AppState>>) -> Json<RustDeskStatusResponse> {
+    let config = state.config.get().rustdesk.clone();
+
+    // 获取服务状态
+    let (service_status, rendezvous_status) = {
+        let guard = state.rustdesk.read().await;
+        if let Some(ref service) = *guard {
+            let status = format!("{}", service.status());
+            let rv_status = service.rendezvous_status().map(|s| format!("{}", s));
+            (status, rv_status)
+        } else {
+            ("not_initialized".to_string(), None)
+        }
+    };
+
+    Json(RustDeskStatusResponse {
+        config: RustDeskConfigResponse::from(&config),
+        service_status,
+        rendezvous_status,
+    })
+}
+
+/// 更新 RustDesk 配置
+pub async fn update_rustdesk_config(
+    State(state): State<Arc<AppState>>,
+    Json(req): Json<RustDeskConfigUpdate>,
+) -> Result<Json<RustDeskConfigResponse>> {
+    // 1. 验证请求
+    req.validate()?;
+
+    // 2. 获取旧配置
+    let old_config = state.config.get().rustdesk.clone();
+
+    // 3. 应用更新到配置存储
+    state
+        .config
+        .update(|config| {
+            req.apply_to(&mut config.rustdesk);
+        })
+        .await?;
+
+    // 4. 获取新配置
+    let new_config = state.config.get().rustdesk.clone();
+
+    // 5. 应用到子系统（热重载）
+    if let Err(e) = apply_rustdesk_config(&state, &old_config, &new_config).await {
+        tracing::error!("Failed to apply RustDesk config: {}", e);
+    }
+
+    Ok(Json(RustDeskConfigResponse::from(&new_config)))
+}
+
+/// 重新生成设备 ID
+pub async fn regenerate_device_id(
+    State(state): State<Arc<AppState>>,
+) -> Result<Json<RustDeskConfigResponse>> {
+    state
+        .config
+        .update(|config| {
+            config.rustdesk.device_id = RustDeskConfig::generate_device_id();
+        })
+        .await?;
+
+    let new_config = state.config.get().rustdesk.clone();
+    Ok(Json(RustDeskConfigResponse::from(&new_config)))
+}
+
+/// 重新生成设备密码
+pub async fn regenerate_device_password(
+    State(state): State<Arc<AppState>>,
+) -> Result<Json<RustDeskConfigResponse>> {
+    state
+        .config
+        .update(|config| {
+            config.rustdesk.device_password = RustDeskConfig::generate_password();
+        })
+        .await?;
+
+    let new_config = state.config.get().rustdesk.clone();
+    Ok(Json(RustDeskConfigResponse::from(&new_config)))
+}
+
+/// 获取设备密码（管理员专用）
+pub async fn get_device_password(State(state): State<Arc<AppState>>) -> Json<serde_json::Value> {
+    let config = state.config.get().rustdesk.clone();
+    Json(serde_json::json!({
+        "device_id": config.device_id,
+        "device_password": config.device_password
+    }))
+}