Migrate frontend to Angular 20 with full Docker support

Implemented a complete Angular 20 migration with modern standalone components architecture and production-ready Docker deployment:

**Frontend Migration:**
- Created Angular 20 application with standalone components (no NgModules)
- Implemented three main components: artifacts-list, upload-form, query-form
- Added TypeScript models and services for type-safe API communication
- Migrated dark theme UI with all existing features
- Configured routing and navigation between views
- Set up development proxy for seamless API integration
- Reactive forms with validation for upload and query functionality
- Auto-refresh artifacts every 5 seconds with RxJS observables
- Client-side sorting, filtering, and search capabilities
- Tags displayed as inline badges, SIM source grouping support

**Docker Integration:**
- Multi-stage Dockerfile for Angular (Node 24 build, nginx Alpine serve)
- nginx configuration for SPA routing and API proxy
- Updated docker-compose.yml with frontend service on port 80
- Health checks for all services
- Production-optimized build with gzip compression and asset caching

**Technical Stack:**
- Angular 20 with standalone components
- TypeScript for type safety
- RxJS for reactive programming
- nginx as reverse proxy
- Multi-stage Docker builds for optimal image size

All features fully functional and tested in Docker environment.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/app/models/artifact.model.ts

@@ -0,0 +1,40 @@
+export interface Artifact {
+  id: number;
+  filename: string;
+  file_type: string;
+  file_size: number;
+  storage_path: string;
+  content_type: string | null;
+  test_name: string | null;
+  test_suite: string | null;
+  test_config: any;
+  test_result: string | null;
+  sim_source_id: string | null;
+  custom_metadata: any;
+  description: string | null;
+  tags: string[] | null;
+  created_at: string;
+  updated_at: string;
+  version: string | null;
+  parent_id: number | null;
+}
+
+export interface ArtifactQuery {
+  filename?: string;
+  file_type?: string;
+  test_name?: string;
+  test_suite?: string;
+  test_result?: string;
+  sim_source_id?: string;
+  tags?: string[];
+  start_date?: string;
+  end_date?: string;
+  limit?: number;
+  offset?: number;
+}
+
+export interface ApiInfo {
+  deployment_mode: string;
+  storage_backend: string;
+  version: string;
+}