feat: Geutebruck GeViScope/GeViSoft Action Mapping System - MVP

This MVP release provides a complete full-stack solution for managing action mappings
in Geutebruck's GeViScope and GeViSoft video surveillance systems.

## Features

### Flutter Web Application (Port 8081)
- Modern, responsive UI for managing action mappings
- Action picker dialog with full parameter configuration
- Support for both GSC (GeViScope) and G-Core server actions
- Consistent UI for input and output actions with edit/delete capabilities
- Real-time action mapping creation, editing, and deletion
- Server categorization (GSC: prefix for GeViScope, G-Core: prefix for G-Core servers)

### FastAPI REST Backend (Port 8000)
- RESTful API for action mapping CRUD operations
- Action template service with comprehensive action catalog (247 actions)
- Server management (G-Core and GeViScope servers)
- Configuration tree reading and writing
- JWT authentication with role-based access control
- PostgreSQL database integration

### C# SDK Bridge (gRPC, Port 50051)
- Native integration with GeViSoft SDK (GeViProcAPINET_4_0.dll)
- Action mapping creation with correct binary format
- Support for GSC and G-Core action types
- Proper Camera parameter inclusion in action strings (fixes CrossSwitch bug)
- Action ID lookup table with server-specific action IDs
- Configuration reading/writing via SetupClient

## Bug Fixes
- **CrossSwitch Bug**: GSC and G-Core actions now correctly display camera/PTZ head parameters in GeViSet
- Action strings now include Camera parameter: `@ PanLeft (Comment: "", Camera: 101028)`
- Proper filter flags and VideoInput=0 for action mappings
- Correct action ID assignment (4198 for GSC, 9294 for G-Core PanLeft)

## Technical Stack
- **Frontend**: Flutter Web, Dart, Dio HTTP client
- **Backend**: Python FastAPI, PostgreSQL, Redis
- **SDK Bridge**: C# .NET 8.0, gRPC, GeViSoft SDK
- **Authentication**: JWT tokens
- **Configuration**: GeViSoft .set files (binary format)

## Credentials
- GeViSoft/GeViScope: username=sysadmin, password=masterkey
- Default admin: username=admin, password=admin123

## Deployment
All services run on localhost:
- Flutter Web: http://localhost:8081
- FastAPI: http://localhost:8000
- SDK Bridge gRPC: localhost:50051
- GeViServer: localhost (default port)

Generated with Claude Code (https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

geutebruck_app/lib/core/storage/token_manager.dart

@@ -0,0 +1,35 @@
+/// Simple in-memory token storage for web (when secure storage fails)
+class TokenManager {
+  static final TokenManager _instance = TokenManager._internal();
+  factory TokenManager() => _instance;
+  TokenManager._internal();
+
+  String? _accessToken;
+  String? _refreshToken;
+  String? _username;
+  String? _userRole;
+
+  void saveTokens({
+    String? accessToken,
+    String? refreshToken,
+    String? username,
+    String? userRole,
+  }) {
+    if (accessToken != null) _accessToken = accessToken;
+    if (refreshToken != null) _refreshToken = refreshToken;
+    if (username != null) _username = username;
+    if (userRole != null) _userRole = userRole;
+  }
+
+  String? get accessToken => _accessToken;
+  String? get refreshToken => _refreshToken;
+  String? get username => _username;
+  String? get userRole => _userRole;
+
+  void clear() {
+    _accessToken = null;
+    _refreshToken = null;
+    _username = null;
+    _userRole = null;
+  }
+}