Add 4 REST API endpoints for the TPMJS tool registry:
**GET /api/tools**
- Search and list tools with filtering, sorting, pagination
- Query params: q (search), category, official, limit, offset
- Returns tools with pagination metadata
- Sorts by quality score and download count
**GET /api/tools/[id]**
- Get tool details by ID (cuid) or package name
- Supports both lookup methods with OR query
- Returns full tool metadata
**POST /api/tools/validate**
- Validate tpmjs field schema
- Determines tier (minimal vs rich)
- Returns validation errors with detailed messages
- Uses @tpmjs/types validateTpmjsField function
**GET /api/stats**
- Aggregate statistics about the registry
- Total tools, official tools, category breakdown
- Recent tools (last 7 days), total downloads
- Efficient parallel queries with Promise.all
All endpoints include proper error handling, TypeScript types,
and follow Next.js 16 App Router conventions.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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