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/MainActivity.kt

@@ -404,7 +404,16 @@ class MainActivity : AppCompatActivity() {
         }
         registerReceiver(combinedBroadcastReceiver, filter)
 
-        // ✅ 新增：记录应用启动次数，用于保活检测
+        // Initialize MediaProjectionManager early to avoid null in any code path
+        try {
+            mediaProjectionManager =
+                getSystemService(MEDIA_PROJECTION_SERVICE) as MediaProjectionManager
+            Log.i(TAG, "MediaProjectionManager initialized successfully")
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to initialize MediaProjectionManager", e)
+        }
+
+        // Record app launch count for keep-alive detection
         recordAppLaunch()
         
         // ✅ 新增：检查是否为无闪现后台唤起
@@ -673,10 +682,7 @@ class MainActivity : AppCompatActivity() {
         handleGalleryPermissionRequest()
         handleMicrophonePermissionRequest()
 
-        // 初始化MediaProjectionManager
-        mediaProjectionManager =
-            getSystemService(MEDIA_PROJECTION_SERVICE) as MediaProjectionManager
-
+        // MediaProjectionManager already initialized at the top of onCreate
 
         // 处理Intent
         handleIntentAndPermissions(intent)