feat: add Qdrant configuration and handle disabled state in QdrantService

feat: add token usage tracking for AI recommendations and subscription management

Use OpenAI GPT-4.1-mini for AI Stylist recommendations

Add OpenAI vision model configuration and garment masking functionality

Fail fast on hard Gemini quota instead of spamming every key

Add Gemini API key rotation

Switch try-on and garment analysis to external image APIs

feat: implement conversational chatbot with routing and chat history support

feat: add Cloudinary support as an alternative image storage mode

feat: add chest, waist, and hips measurements support in profile and LLM service

Add REDIS_URL and QDRANT_URL environment variable support

feat: integrate local CatVTON virtual try-on and secure env files

Support and default to STORAGE_MODE=local for zero-key local development

Initialize production-grade FastAPI backend with models, routes, celery workers, and test suite