- Remove User/Quota models; quota fields now live directly on APIKey - Admin UI: login, API key management, settings (Ollama URL/model), proxy info display - .env/.env.example: ADMIN_PASSWORD, PROXY_HOST/PORT, DATABASE_URL, APP_TZ - Admin API runs on 127.0.0.1 only; proxy host/port configurable - API keys support optional expires_at; verified against Europe/Berlin timezone - Daily/monthly quota resets use Europe/Berlin midnight boundary - Fix all tests to use new flat model; add expiry tests Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>