- New API /api/chatbot/models: fetches model list from configured endpoint (/models, OpenAI/Ollama format) - Uses saved site_settings endpoint+key, or accepts endpoint/apiKey query params (unsaved custom provider) - UI: 'Загрузить модели' button in Provider tab — loads models into select - Manual model input always available for Custom providers - No more hardcoded Ollama-only model list