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>

back/src/modules/apis/dto/create-api-entry.dto.ts

@@ -0,0 +1,27 @@
+import { IsString, IsNotEmpty, IsIn, IsOptional, IsUUID } from 'class-validator';
+import { ApiType } from '@datacat/shared';
+
+export class CreateApiEntryDto {
+  @IsString()
+  @IsNotEmpty()
+  title!: string;
+
+  @IsString()
+  @IsNotEmpty()
+  version!: string;
+
+  @IsString()
+  @IsOptional()
+  description?: string;
+
+  @IsIn(['ASYNCAPI', 'OPENAPI'])
+  type!: ApiType;
+
+  @IsString()
+  @IsNotEmpty()
+  yamlContent!: string;
+
+  @IsUUID()
+  @IsOptional()
+  categoryId?: string;
+}