fix: Resolve frontend Docker build issues

- Add missing nginx configuration for frontend container
- Add ajv dependency to fix react-scripts build error
- Configure npm to use legacy-peer-deps in Dockerfile
- Create frontend .dockerignore file
- Fix TypeScript peer dependency conflicts

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

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

frontend/.dockerignore

@@ -0,0 +1,16 @@
+node_modules
+npm-debug.log
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+.DS_Store
+.vscode
+.idea
+*.log
+build
+dist
+coverage
+.git
+.gitignore