[#380] Track chatbot semantic search costs and performance

Update VITE_API_BASE_URL to point to the new prod url

- Introduced a new `endpoints.ts` file to centralize all API endpoint paths for better maintainability and type safety.
- Updated various components and services to utilize the new centralized endpoints, enhancing consistency across the codebase.
- Created a comprehensive `API_ENDPOINTS_REFACTORING.md` guide detailing the refactoring process and usage patterns for the new endpoints.
- Removed hardcoded URLs in favor of the centralized configuration, improving code readability and reducing the risk of errors.

- Update Django URLs to serve all APIs under /api/ prefix
- Change frontend to use relative URLs (empty baseURL) instead of environment-specific domains
- Create centralized endpoints.ts for maintainable API URL management
- Update all frontend components to use centralized endpoints
- Remove all VITE_API_BASE_URL and REACT_APP_API_BASE_URL dependencies
- Add helper functions for dynamic endpoints with parameters

This ensures the same Docker image works in both production and sandbox
environments without requiring environment-specific configuration.

Fixes:
- Frontend calling old domain (balancer.live.k8s.phl.io)
- API calls failing after domain migration
- /login and /adminportal pages not working

Closes #431

…e-domains

refactor: use relative URLs and centralize API endpoints (closes #431)

ci: refactor pipelines for continuous deployment to sandbox