feat: add /moodboard endpoint for visual style guide generation

feat: Add HyperFrames animation standard to AI system prompt for better code quality

fix: use HF auto-routing endpoint that works with all Qwen models

fix: multi-provider fallback + Qwen-Coder text fallback for /chat endpoint

feat: add /chat endpoint with Qwen2.5-VL-72B for AI animation generation

feat: Puppeteer + FFmpeg render server for HTML to MP4