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/env.d.ts

@@ -5,3 +5,13 @@ declare module '*.vue' {
     const component: DefineComponent<Record<string, never>, Record<string, never>, Record<string, never>>;
     export default component;
 }
+
+interface ImportMetaEnv {
+    readonly VITE_GATEWAY_API_URL?: string;
+    readonly VITE_GAME_API_URL?: string;
+    readonly VITE_GAME_PROFILE?: string;
+}
+
+interface ImportMeta {
+    readonly env: ImportMetaEnv;
+}