Add "Example Use Cases" section to collection pages that generates
practical workflow examples showing how tools can work together.
- Add useCases and useCasesGeneratedAt fields to Collection model
- Create use-cases-generator.ts using Vercel AI SDK with gpt-4.1-mini
- Add POST /api/collections/[id]/use-cases/generate endpoint
- Add AI_GENERATION_RATE_LIMIT (5 req/hour per IP)
- Create UseCasesSection component with generate/regenerate UI
- Generate 6 use cases: 3 simple (1-2 tools) + 3 complex (3-5 tools)
- Include useCases in public collection API response
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