feat: stop all servers in noti center (#901)

lib/core/chan.dart

@@ -77,8 +77,10 @@ abstract final class MethodChans {
   }
 
   /// Register a handler for native -> Flutter callbacks.
-  /// Currently handles: `disconnectSession` with argument map {id: string}
-  static void registerHandler(Future<void> Function(String id) onDisconnect) {
+  /// Currently handles: 
+  /// - `disconnectSession` with argument map {id: string}
+  /// - `stopAllConnections` with no arguments
+  static void registerHandler(Future<void> Function(String id) onDisconnect, [VoidCallback? onStopAll]) {
     _channel.setMethodCallHandler((call) async {
       switch (call.method) {
         case 'disconnectSession':
@@ -88,6 +90,9 @@ abstract final class MethodChans {
             await onDisconnect(id);
           }
           return;
+        case 'stopAllConnections':
+          onStopAll?.call();
+          return;
         default:
           return;
       }

lib/data/ssh/session_manager.dart

@@ -51,12 +51,31 @@ abstract final class TermSessionManager {
 
   static void init() {
     if (isAndroid) {
-      MethodChans.registerHandler((id) async {
-        _entries[id]?.disconnect?.call();
-      });
+      MethodChans.registerHandler(
+        (id) async {
+          _entries[id]?.disconnect?.call();
+        }, 
+        () {
+          // Stop all connections when notification "Stop All" is pressed
+          stopAllConnections();
+        },
+      );
     }
   }
 
+  /// Called when Android notification "Stop All" button is pressed
+  static void stopAllConnections() {
+    // Disconnect all sessions
+    final disconnectCallbacks = _entries.values.map((e) => e.disconnect).where((cb) => cb != null).toList();
+    for (final disconnect in disconnectCallbacks) {
+      disconnect!();
+    }
+    // Clear all entries
+    _entries.clear();
+    _activeId = null;
+    _sync();
+  }
+
   /// Add a session record and push update to Android.
   static void add({
     required String id,

lib/view/page/server/connection_stats.dart

@@ -98,7 +98,7 @@ class _ConnectionStatsPageState extends State<ConnectionStatsPage> {
                   ),
                 ),
                 Text(
-                  '${libL10n.success}: $successRate%',
+                  '${libL10n.success}: $successRate',
                   style: TextStyle(
                     fontSize: 16,
                     color: stats.successRate >= 0.8