Fix provider names to match OpenRouter API (z-ai, mistralai, moonshotai, deepseek, meta-llama, etc.)

Add OpenRouter support + 15+ popular models (Qwen, Grok, MiMo, Seed, Nemotron, GLM, Mercury, etc.)

Add support for multiple LLM providers (Zhipu, Moonshot, MiniMax, Mistral, Cohere, Groq, etc.)

Make LLM_MODEL required + add Duplicate Space button

Remove LLM_PROVIDER entirely - auto-detect from model name

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