fix: Update getCurrentUser method to use correct API endpoint

- Change the API request in getCurrentUser from '/user' to '/auth' to align with the updated authentication flow.

src/lib/api/lnbits.ts

@@ -152,7 +152,7 @@ class LnbitsAPI {
 
   async getCurrentUser(): Promise<User> {
     console.log('getCurrentUser called, accessToken:', this.accessToken ? 'present' : 'missing')
-    const user = await this.request<User>('/user')
+    const user = await this.request<User>('/auth')
     console.log('getCurrentUser response:', user)
     return user
   }