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>

infra/docker-compose.yml

@@ -0,0 +1,72 @@
+name: datacat
+
+services:
+  backend:
+    build:
+      context: ..
+      dockerfile: infra/Dockerfile.back.dev
+    ports:
+      - "3010:3000"
+    volumes:
+      - ..:/workspace
+      - back_node_modules:/workspace/back/node_modules
+      - shared_node_modules:/workspace/shared/node_modules
+      - docs_output:/app/docs-output
+    environment:
+      DATABASE_HOST: db
+      DATABASE_PORT: 5432
+      DATABASE_USER: datacat
+      DATABASE_PASSWORD: datacat
+      DATABASE_NAME: datacat
+      NODE_ENV: development
+      DOCS_OUTPUT_DIR: /app/docs-output
+    working_dir: /workspace/back
+    command: sh -c "cd /workspace && pnpm install && cd /workspace/back && pnpm run start:dev"
+    networks:
+      - network
+    depends_on:
+      db:
+        condition: service_healthy
+
+  frontend:
+    build:
+      context: ..
+      dockerfile: infra/Dockerfile.front.dev
+    ports:
+      - "4200:4200"
+    volumes:
+      - ..:/workspace
+      - front_node_modules:/workspace/front-public/node_modules
+    working_dir: /workspace/front-public
+    command: sh -c "cd /workspace && pnpm install && cd /workspace/front-public && node_modules/.bin/ng serve --host 0.0.0.0 --proxy-config proxy.conf.docker.json"
+    networks:
+      - network
+
+  db:
+    image: postgres:17-alpine
+    environment:
+      POSTGRES_USER: datacat
+      POSTGRES_PASSWORD: datacat
+      POSTGRES_DB: datacat
+    ports:
+      - "5432:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    networks:
+      - network
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U datacat"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+networks:
+  network:
+    driver: bridge
+
+volumes:
+  back_node_modules:
+  shared_node_modules:
+  front_node_modules:
+  postgres_data:
+  docs_output: