chore: update LNBits API configuration in environment and documentation

- Added VITE_LNBITS_API_URL to .env.example for LNBits API integration.
- Updated AUTHENTICATION.md to reflect changes in LNBits base URL configuration.
- Refactored ProfileDialog.vue and config files to use VITE_LNBITS_BASE_URL instead of VITE_API_BASE_URL for API calls.

src/components/auth/ProfileDialog.vue

@@ -22,7 +22,7 @@ const emit = defineEmits<Emits>()
 const userDisplay = computed(() => auth.userDisplay.value)
 
 // Get the API base URL from environment variables
-const apiBaseUrl = import.meta.env.VITE_API_BASE_URL || ''
+const apiBaseUrl = import.meta.env.VITE_LNBITS_BASE_URL || ''
 
 function handleLogout() {
   auth.logout()

src/lib/config/index.ts

@@ -52,7 +52,7 @@ export const config: AppConfig = {
     adminPubkeys: parseJsonEnv(import.meta.env.VITE_ADMIN_PUBKEYS, [])
   },
   api: {
-    baseUrl: import.meta.env.VITE_API_BASE_URL || '',
+    baseUrl: import.meta.env.VITE_LNBITS_BASE_URL || '',
     key: import.meta.env.VITE_API_KEY || ''
   },
   push: {

src/lib/config/lnbits.ts

@@ -2,7 +2,7 @@
 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',
+  API_BASE_URL: `${import.meta.env.VITE_LNBITS_BASE_URL || ''}/api/v1`,
   
   // Whether to enable debug logging
   DEBUG: import.meta.env.VITE_LNBITS_DEBUG === 'true',