Migration lego-hunter to Tinyfish SDK

[KrishnaAgarwal7531]

Migrates Lego Restock Hunter from OpenAI-based URL generation to the TinyFish SDK, removing the @ai-sdk/openai and ai dependencies entirely.
The original generate-urls route used GPT-4o-mini to hallucinate search URLs for 15 hardcoded retailers — results were often wrong or outdated. The new /api/discover-retailers runs two parallel TinyFish Search queries targeted at the specific LEGO set name, finding real current product pages across retailers without any LLM involvement.
/api/search-lego replaces the raw Mino SSE fetch with client.agent.stream — typed EventType.STREAMING_URL, EventType.PROGRESS, EventType.COMPLETE + RunStatus.COMPLETED, with result content validation. Deal analysis is now built-in price sorting logic rather than a second GPT-4o-mini call — no LLM needed to determine which price is lower.

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[simantak-dabhade]

Clean migration. Fixed next-env.d.ts. Build passes.