refactor: Transition to authentication system and remove identity management

- Replace identity management with a new authentication system across the application.
- Update App.vue to integrate LoginDialog and remove PasswordDialog.
- Modify Navbar.vue to handle user authentication state and logout functionality.
- Enhance Home.vue to display user information upon login.
- Implement routing changes in index.ts to enforce authentication requirements for protected routes.

src/lib/config/lnbits.ts

@@ -0,0 +1,38 @@
+// LNBits API Configuration
+export const LNBITS_CONFIG = {
+  // Base URL for the LNBits API
+  // This should point to your LNBits instance
+  API_BASE_URL: import.meta.env.VITE_LNBITS_API_URL || '/api/v1',
+  
+  // Whether to enable debug logging
+  DEBUG: import.meta.env.VITE_LNBITS_DEBUG === 'true',
+  
+  // Timeout for API requests (in milliseconds)
+  REQUEST_TIMEOUT: 10000,
+  
+  // Auth token storage key
+  AUTH_TOKEN_KEY: 'lnbits_access_token',
+  
+  // User storage key
+  USER_STORAGE_KEY: 'lnbits_user_data'
+}
+
+// Helper function to get the full API URL
+export function getApiUrl(endpoint: string): string {
+  return `${LNBITS_CONFIG.API_BASE_URL}${endpoint}`
+}
+
+// Helper function to get auth token from storage
+export function getAuthToken(): string | null {
+  return localStorage.getItem(LNBITS_CONFIG.AUTH_TOKEN_KEY)
+}
+
+// Helper function to set auth token in storage
+export function setAuthToken(token: string): void {
+  localStorage.setItem(LNBITS_CONFIG.AUTH_TOKEN_KEY, token)
+}
+
+// Helper function to remove auth token from storage
+export function removeAuthToken(): void {
+  localStorage.removeItem(LNBITS_CONFIG.AUTH_TOKEN_KEY)
+}