Update README and documentation; refactor frontend components for improved structure and resilience

.cursor/rules/api-standards.mdc

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+---
+description: API validation and service standards
+globs: ["services/**/*.java", "services/**/*.py", "services/**/*.js"]
+alwaysApply: false
+---
+
+# API Standards
+
+## API Documentation
+
+### OpenAPI Requirements
+- All endpoints MUST have OpenAPI documentation
+- Include request/response schemas
+- Provide example requests and responses
+- Document error responses
+- Include authentication requirements
+
+### Documentation Tags
+- Use consistent tags for endpoint grouping
+- Provide clear descriptions
+- Include parameter documentation
+- Document response codes
+
+## Error Handling
+
+### Consistent Error Responses
+```javascript
+// Standard error response format
+{
+  "error": "Error type",
+  "message": "User-friendly message",
+  "timestamp": "2024-01-01T00:00:00Z",
+  "details": "Additional error details"
+}
+```
+
+### HTTP Status Codes
+- 200: Success
+- 201: Created
+- 400: Bad Request
+- 401: Unauthorized
+- 403: Forbidden
+- 404: Not Found
+- 500: Internal Server Error
+- 503: Service Unavailable
+
+## Service-Specific Standards
+
+### Java Spring Boot
+- Use constructor injection
+- Implement proper validation
+- Use appropriate annotations
+- Follow REST conventions
+- Implement global exception handling
+
+### Python FastAPI
+- Use Pydantic models
+- Implement async/await
+- Use dependency injection
+- Follow OpenAPI standards
+- Implement proper error handling
+
+### Node.js Express
+- Use middleware appropriately
+- Implement proper error handling
+- Use async/await patterns
+- Follow REST conventions
+- Implement health checks
+
+## Validation
+
+### Input Validation
+- Validate all inputs
+- Sanitize user data
+- Use appropriate data types
+- Implement rate limiting
+
+### Response Validation
+- Validate response schemas
+- Use consistent data formats
+- Implement proper error handling
+- Document response structures
+
+## Performance
+
+### API Performance
+- Use pagination for large datasets
+- Implement response compression
+- Use appropriate HTTP methods
+- Optimize response sizes
+
+### Caching
+- Implement appropriate caching
+- Use Redis for distributed caching
+- Cache frequently accessed data
+- Implement cache invalidation