feat: initial scaffold — MVP catalogue de données d'API

- Backend NestJS : CRUD api_entries + categories, upload YAML multi-fichiers,
  génération docs AsyncAPI (@asyncapi/cli@6.0.0) et OpenAPI (redocly)
- Fix: route wildcard GET /api/apis/:id/*path pour servir les assets statiques
  (CSS/JS) générés par AsyncAPI HTML template (contournement bug path-to-regexp v8)
- Frontend Angular 19 : pages catalog, browse, api-detail, doc-viewer, upload (DSFR)
- Seeder de données de démo (idempotent)
- Docker Compose dev + Dockerfiles + manifests K8s
- Documentation : README, architecture, référence API REST

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

documentation/README.md

@@ -0,0 +1,24 @@
+# Datacat
+
+A data catalog for API documentation. Import YAML files (AsyncAPI / OpenAPI) and generate
+HTML documentation automatically via AsyncAPI CLI and Redocly CLI.
+
+## Quick start
+
+```bash
+# Dev (Docker)
+pnpm run dev
+
+# Dev (local)
+cd back && pnpm run start:dev
+cd front-public && pnpm run start
+```
+
+## URLs (dev)
+
+- Frontend: https://datacat.dev.chmod777.dev
+- API: https://api.datacat.dev.chmod777.dev
+- Local frontend: http://localhost:4200
+- Local API: http://localhost:3000
+
+## See CLAUDE.md for the full implementation guide.