Backend:
- User model gains e621_username / e621_api_key / e621_base_url
- GET/PUT /api/auth/e621/ for the owner's credentials; /me exposes only
the username and a configured flag, never the key
Frontend:
- e621 client core: Basic auth, _client param (browsers cannot set a
User-Agent), serialized queue throttled to 1 request/second, readable
error mapping
- Account screen (/account): username, API key with reveal toggle,
base URL (e621 / e926 / custom), Save + Test connection
- Credentials are fetched from the backend and held in memory only,
cleared on logout
JakeBreath
b6409523e6