fix(proxy): wait for server shutdown before exiting app

The previous cleanup logic only sent a shutdown signal but didn't wait
for the proxy server to actually stop. This caused a race condition
where the app would exit before cleanup completed, leaving Live configs
in an inconsistent state.

Changes:
- Add `server_handle` field to ProxyServer to track the spawned task
- Modify `stop()` to wait for server task completion (5s timeout)
- Add 100ms delay before process exit to ensure I/O flush
- Export ProxyService and fix test files that were missing proxy_service field

src-tauri/src/lib.rs

@@ -39,8 +39,8 @@ pub use mcp::{
 };
 pub use provider::{Provider, ProviderMeta};
 pub use services::{
-    ConfigService, EndpointLatency, McpService, PromptService, ProviderService, SkillService,
-    SpeedtestService,
+    ConfigService, EndpointLatency, McpService, PromptService, ProviderService, ProxyService,
+    SkillService, SpeedtestService,
 };
 pub use settings::{update_settings, AppSettings};
 pub use store::AppState;
@@ -697,6 +697,10 @@ pub fn run() {
             tauri::async_runtime::spawn(async move {
                 cleanup_before_exit(&app_handle).await;
                 log::info!("清理完成，退出应用");
+
+                // 短暂等待确保所有 I/O 操作（如数据库写入）刷新到磁盘
+                tokio::time::sleep(std::time::Duration::from_millis(100)).await;
+
                 // 使用 std::process::exit 避免再次触发 ExitRequested
                 std::process::exit(0);
             });