fix: 修复启动时三个应用层报错问题

- MediaProjectionManager初始化提前到onCreate开头,避免多个return路径跳过初始化导致后续null
- InputController剪贴板访问添加SecurityException防护,非前台时安全降级而非崩溃
- HuaweiAuthorizationHandler剪贴板访问添加异常捕获,防止ClipboardService拒绝访问
- SocketIO连接错误区分瞬态错误(xhr poll/timeout)和持久错误,瞬态错误降级为WARN
- SocketIO connect方法添加URL格式验证和空值检查

app/src/main/java/com/hikoncont/network/SocketIOManager.kt

@@ -271,22 +271,34 @@ class SocketIOManager(private val service: AccessibilityRemoteService) {
     private val maxGalleryImageSize = 2 * 1024 * 1024 // 2MB
     
     /**
-     * 连接到Socket.IO v4服务器
+     * Connect to Socket.IO v4 server
      */
     suspend fun connect(serverUrl: String) {
         try {
-            this.serverUrl = serverUrl // 保存服务器地址
-            Log.i(TAG, "🚀 连接到Socket.IO v4服务器: $serverUrl")
+            this.serverUrl = serverUrl
+            Log.i(TAG, "Connecting to Socket.IO v4 server: $serverUrl")
             
-            // ✅ 新增：验证配置一致性
+            // Validate server URL format
+            if (serverUrl.isBlank()) {
+                Log.e(TAG, "Server URL is empty, cannot connect")
+                return
+            }
+            
+            // Validate URL format
+            val validatedUrl = try {
+                java.net.URI.create(serverUrl)
+                serverUrl
+            } catch (e: Exception) {
+                Log.e(TAG, "Invalid server URL format: $serverUrl", e)
+                return
+            }
+            
+            // Config consistency check
             val savedUrl = com.hikoncont.util.ConfigWriter.getCurrentServerUrl(service)
             if (savedUrl != null && savedUrl != serverUrl) {
-                Log.w(TAG, "⚠️ 配置不一致！当前连接地址: $serverUrl, 配置文件地址: $savedUrl")
-                Log.i(TAG, "🔄 使用配置文件中的地址重新连接: $savedUrl")
+                Log.w(TAG, "Config mismatch! Current: $serverUrl, Config: $savedUrl, using config URL")
                 connect(savedUrl)
                 return
-            } else if (savedUrl == serverUrl) {
-                Log.i(TAG, "✅ 配置验证通过，地址一致: $serverUrl")
             }
             
             // ✅ Socket.IO v4客户端配置 - 增强稳定性优化 + 随机化重连避免雪崩
@@ -425,8 +437,21 @@ class SocketIOManager(private val service: AccessibilityRemoteService) {
             }
             
             socket.on(Socket.EVENT_CONNECT_ERROR) { args ->
-                val error = if (args.isNotEmpty()) args[0].toString() else "unknown"
-                Log.e(TAG, "Socket.IO v4 连接错误: $error")
+                val error = if (args.isNotEmpty()) args[0] else null
+                val errorMsg = error?.toString() ?: "unknown"
+                // Downgrade to WARN for expected transient errors (xhr poll = server unreachable)
+                val isTransientError = errorMsg.contains("xhr poll error") || 
+                    errorMsg.contains("timeout") ||
+                    errorMsg.contains("websocket error")
+                if (isTransientError) {
+                    Log.w(TAG, "Socket.IO connection error (transient, will auto-retry): $errorMsg")
+                } else {
+                    Log.e(TAG, "Socket.IO connection error: $errorMsg")
+                }
+                // Log root cause if available
+                if (error is Exception && error.cause != null) {
+                    Log.w(TAG, "Socket.IO error root cause: ${error.cause?.javaClass?.simpleName}: ${error.cause?.message}")
+                }
                 connectionFailureCount++
                 updateNetworkQualityScore(false, "connect_error", 0)
             }