feat: initial schemas-app implementation

- Add Nuxt 4 application with Vuetify UI framework
- Implement GraphQL schema registry management interface
- Add Apollo Client integration with Auth0 authentication
- Create organization and API key management
- Add schema and ref browsing capabilities
- Implement organization switcher for multi-org users
- Add delete functionality for organizations and API keys
- Create Kubernetes deployment descriptors
- Add Docker configuration with nginx

Features:
- Dashboard with organization overview
- Schema browsing by ref with supergraph viewing
- Ref management with schema details
- Settings page for organizations and API keys
- User list per organization with provider icons
- Admin-only organization creation
- Delete confirmations with warnings

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

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

nginx/security_headers.conf

@@ -0,0 +1,10 @@
+add_header Strict-Transport-Security 'max-age=63072000; includeSubDomains; preload';
+add_header Content-Security-Policy "frame-ancestors 'none'";
+add_header X-XSS-Protection "0";
+add_header X-Frame-Options "SAMEORIGIN";
+add_header Referrer-Policy strict-origin-when-cross-origin;
+add_header X-Content-Type-Options nosniff;
+add_header X-Permitted-Cross-Domain-Policies master-only;
+add_header Feature-Policy '*=*';
+add_header Permissions-Policy '*=*';
+add_header Document-Policy 'unsized-media=?0, document-write=?0, max-image-bpp=2.0, frame-loading=lazy';