feat: Implement session management and routing for general creation

- Added session initialization in main.ts to manage user sessions.
- Updated router to include a new route for joining or creating a general.
- Enhanced session store with methods for managing session tokens and user profiles.
- Introduced new components for displaying city, general, nation, and command information.
- Implemented loading states and error handling in the main view.
- Created a skeleton loader component for better user experience during data fetching.
- Updated TypeScript definitions for route metadata to include new authentication requirements.

app/game-frontend/src/router/meta.d.ts

@@ -4,6 +4,7 @@ declare module 'vue-router' {
     interface RouteMeta {
         requiresAuth?: boolean;
         requiresGeneral?: boolean;
+        requiresNoGeneral?: boolean;
         publicOnly?: boolean;
     }
 }