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feat: Hugging-c-ai v2 — HF OAuth + multi-provider AI + HF bucket storage + Gradio
- Replace Google OAuth with HuggingFace OAuth (openid profile email repo:write read scopes)
- Multi-provider AI: OpenAI, Anthropic, HuggingFace Inference, Groq, MuAPI, custom Gradio Servers
- 17 models in catalog, grouped by provider in UI
- SSE streaming responses for OpenAI/Anthropic/HF/Groq
- HF Dataset bucket storage for uploads (HfFileSystem via @huggingface/hub)
- Custom Gradio endpoint support (connect any HF Space as LLM)
- /explore page: character marketplace
- SQLite by default (zero setup), Prisma 7 + libsql adapter
- Per-model credit pricing, token usage tracking
- Dockerfile for HF Space deployment
