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>

docker/Dockerfile.frontend

@@ -6,6 +6,9 @@ WORKDIR /app
 # Copy package files
 COPY package*.json ./
 
+# Configure npm to use legacy peer deps
+RUN npm config set legacy-peer-deps true
+
 # Install dependencies
 RUN npm ci