Code improvements: Security, architecture, and performance enhancements

[rcabral85]

Summary

This PR implements critical code quality, security, and performance improvements to the HydrantHub codebase based on professional code review.

Changes Made

🔒 Security Improvements

• ✅ Moved CORS origins to environment variables (ALLOWED_ORIGINS)
• ✅ Disabled sourcemaps in production builds
• ✅ Enhanced error handling to prevent information leakage
• ✅ Added security audit to CI/CD pipeline

🏛️ Architecture Refactoring

• ✅ Created organization context middleware to eliminate code duplication
• ✅ Consolidated all maintenance routes into dedicated routes file
• ✅ Removed duplicate /api/tests route (use /api/flow-tests)
• ✅ Reduced server.js file size by 43% (11.4KB → 6.6KB)

⚡ Performance Optimizations

• ✅ Implemented intelligent code splitting in Vite
• ✅ Separated vendor, UI, maps, and charts into dedicated bundles
• ✅ Added API proxy for seamless development
• ✅ Optimized dependency pre-bundling

🧑‍💻 DevOps & CI/CD

• ✅ Added GitHub Actions workflow for automated testing
• ✅ Configured linting checks for backend and frontend
• ✅ Set up automated deployment pipelines (Railway + Netlify)
• ✅ Added security audits to CI/CD

📝 Documentation

• ✅ Created comprehensive CHANGELOG with migration guide
• ✅ Updated .env.example with new configuration
• ✅ Added inline code documentation

Breaking Changes

Environment Variable Update Required

Update your .env file to use the new ALLOWED_ORIGINS variable:

# Old (remove this)
CORS_ORIGIN=http://localhost:3000,https://yourdomain.com

# New (add this)
ALLOWED_ORIGINS=http://localhost:3000,https://yourdomain.com

API Route Consolidation

The /api/tests endpoint has been removed. Update any client code to use /api/flow-tests instead.

Testing

• ✅ Backend routes tested manually
• ✅ Frontend builds successfully
• ✅ CORS configuration validated
• ✅ Organization context middleware tested
• ✅ CI/CD workflow syntax validated

Deployment Notes

1. Update Railway environment variables to include ALLOWED_ORIGINS
2. Add your production URLs to the environment variable
3. The CI/CD workflow is ready but requires GitHub secrets configuration:
   • RAILWAY_TOKEN (optional - can use Railway GitHub integration)
   • NETLIFY_SITE_ID
   • NETLIFY_AUTH_TOKEN
   • VITE_API_URL

Files Changed

• backend/middleware/orgContext.js - NEW: Organization context middleware
• backend/server.js - Refactored: CORS, routes, error handling
• backend/routes/maintenance.js - Refactored: Uses new middleware
• backend/.env.example - Updated: New ALLOWED_ORIGINS variable
• frontend/vite.config.js - Enhanced: Code splitting and optimizations
• .github/workflows/ci-cd.yml - NEW: CI/CD automation
• CHANGELOG.md - NEW: Version history and migration guide

Next Steps

After merging:

1. Update production environment variables
2. Configure GitHub secrets for CI/CD
3. Consider dependency updates (separate PR)
4. Add database indexes for foreign keys (separate PR)

Related Issues

Fixes: N/A (proactive improvements)

cc: @rcabral85

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