Test: Try gemma-3-27b-it model for chat

Change chat model to gemini-1.5-flash for better API limits

gemini model change

Update chat to use google-genai SDK instead of REST API

Add Gemini chatbot test widget with floating button and /api/chat endpoint

Add optional HF Hub cloud storage for videos with auto folders per module

Add image retry logic (NVIDIA) and fix video playback mounting

Initial commit: NCAkit with Story Reels module