Implement auth guard and app branding improvements

Auth & Routing:
- Initialize auth before router guards to prevent race conditions
- Default all routes to require auth unless explicitly set to false
- Add initial route check to redirect unauthenticated users to /login
- Remove duplicate auth initialization from base module

App Branding:
- Add VITE_APP_NAME environment variable for configurable branding
- Replace hardcoded "Ariège" references with environment variable
- Update index.html, market composable to use dynamic app name

Mobile UX:
- Fix mobile dropdown auto-close on navigation item selection

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/modules/base/index.ts

@@ -50,10 +50,7 @@ export const baseModule: ModulePlugin = {
     // Initialize core services
     relayHub.setRelayUrls(options?.config?.nostr?.relays || [])
     await relayHub.initialize()
-    await auth.initialize({
-      waitForDependencies: false, // Auth has no dependencies
-      maxRetries: 1
-    })
+    // Auth initialization moved to app.ts before router guards
     await paymentService.initialize({
       waitForDependencies: true, // PaymentService depends on AuthService
       maxRetries: 3