fix(proxy): reset health badges when proxy stops

Clear all provider_health records when stopping the proxy server,
ensuring health badges reset to "healthy" state. This fixes the
inconsistency where circuit breakers (in memory) would reset on
stop but health badges (in database) would retain stale state.

src-tauri/src/services/proxy.rs

@@ -306,6 +306,12 @@ impl ProxyService {
             .await
             .map_err(|e| format!("删除备份失败: {e}"))?;
 
+        // 5. 重置健康状态（让健康徽章恢复为正常）
+        self.db
+            .clear_all_provider_health()
+            .await
+            .map_err(|e| format!("重置健康状态失败: {e}"))?;
+
         log::info!("代理已停止，Live 配置已恢复");
         Ok(())
     }