feat(create-app): add API Route Generator (3.3) + AGENTS.md Auto-Generator (3.4)
3.3 API Route Generator (api-routes.ts):
- Two modes: 'direct' (Cosmos DB CRUD) and 'proxy' (backend fetch)
- Generates route.ts + [id]/route.ts (Next.js App Router named exports)
- Direct mode also generates lib/schemas/ + lib/repositories/ files
- withErrorHandler HOF wrapper, Zod validation, auth check
- Dry-run preview, configurable methods, skip existing files
3.4 AGENTS.md Auto-Generator (agents-md.ts):
- Reads shared/product.json for identity, port, domain
- Scans repo for backend modules, lib files, test counts
- Generates full AGENTS.md with identity, layout, stack, conventions
- --update preserves CUSTOM sections
- Creates CLAUDE.md, .cursorrules, .windsurfrules symlinks
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