Flutter-App mit WebView, STOMP-Client und Konfigurationssystem

- Flutter-App (app/) für iOS, Android, macOS, Windows und Linux erstellt
- WebView-Startseite mit flutter_inappwebview (iOS/Android/macOS/Windows),
  Linux-Fallback mit url_launcher
- STOMP-over-WebSocket: Topic-basierte Echtzeit-Kommunikation zwischen
  Flutter-App und Spring Boot Core
- Core: STOMP-Broker (/ws/stomp), CallEventBroadcaster auf /topic/calls,
  StompMessageController für /app/ping und /app/broadcast
- SecurityConfig: /ws/** permitAll + CSRF-Ausnahme
- Asset-basierte Konfigurationsdatei (app_config.json) für Server-URL,
  STOMP-Reconnect, Topics und WebView-URL
- launch.json um Flutter-Debug/Profile/Release-Konfigurationen erweitert
- macOS: FLTEnableMergedPlatformUIThread deaktiviert (WKWebView-Kompatibilität),
  network.client Entitlement gesetzt
- iOS: NSAllowsLocalNetworking für lokale Entwicklung
- Android: INTERNET-Permission und usesCleartextTraffic

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/.metadata

@@ -0,0 +1,42 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: "8b872868494e429d94fa06dca855c306438b22c0"
+  channel: "stable"
+
+project_type: app
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: 8b872868494e429d94fa06dca855c306438b22c0
+      base_revision: 8b872868494e429d94fa06dca855c306438b22c0
+    - platform: android
+      create_revision: 8b872868494e429d94fa06dca855c306438b22c0
+      base_revision: 8b872868494e429d94fa06dca855c306438b22c0
+    - platform: ios
+      create_revision: 8b872868494e429d94fa06dca855c306438b22c0
+      base_revision: 8b872868494e429d94fa06dca855c306438b22c0
+    - platform: linux
+      create_revision: 8b872868494e429d94fa06dca855c306438b22c0
+      base_revision: 8b872868494e429d94fa06dca855c306438b22c0
+    - platform: macos
+      create_revision: 8b872868494e429d94fa06dca855c306438b22c0
+      base_revision: 8b872868494e429d94fa06dca855c306438b22c0
+    - platform: windows
+      create_revision: 8b872868494e429d94fa06dca855c306438b22c0
+      base_revision: 8b872868494e429d94fa06dca855c306438b22c0
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'