Feature: Improve Add Hydrant - HYD-### format, auto-fill address, minimal required fields

[rcabral85]

Summary

This PR improves the Add Hydrant feature with three key enhancements:

1. HYD-### hydrant number format with auto-increment
2. Auto-fill address when picking location on map
3. Only 3 mandatory fields: hydrant_number, manufacturer, and address

Changes Made

1. Hydrant Number Format

• Changed from MLT-### to HYD-001, HYD-002, etc.
• Auto-generates next sequential number by querying existing hydrants
• Updated validation pattern to enforce HYD-### format
• Fallback to random number if API call fails

2. Map Location Auto-Fill

• When user picks location on map, address is automatically filled
• Uses OpenStreetMap Nominatim reverse geocoding API
• Shows loading indicator while fetching address
• Reduces manual data entry and improves accuracy

3. Minimal Required Fields

Required fields (3 total):

• Hydrant Number (HYD-###)
• Manufacturer
• Address

Optional fields:

• Model, Installation Date, Location Description
• Watermain Size, Static Pressure
• Operational Status, NFPA Classification
• Inspector Notes

Files Modified

• frontend/src/components/HydrantAdd.jsx - Complete rewrite of validation and form logic
• HYDRANT_ADD_IMPROVEMENTS.md - Comprehensive documentation of changes

Testing Checklist

• Generate button creates HYD-001, HYD-002, etc. in sequence
• Map picker auto-fills address when location is selected
• Can save hydrant with only 3 required fields
• New hydrants appear immediately on maps page
• New hydrants available in maintenance section for inspection
• Optional fields save correctly when provided
• Validation errors show for missing required fields
• Loading spinner appears during address fetch

Integration Points

Backend Compatibility

✅ No backend changes required - existing API already supports optional fields

Database

✅ No migrations required - schema already supports nullable fields

Maps Section

✅ Hydrants appear immediately after creation with correct coordinates

Maintenance Section

✅ New hydrants available for operators to perform inspections

Flow Testing

✅ Works with minimal hydrant data, populates missing fields over time

User Experience Improvements

• Added info badge: "Only Hydrant Number, Manufacturer, and Address are required"
• All optional fields clearly labeled "(Optional)"
• Map button text: "Pick Location on Map (Auto-fills Address)"
• Faster data entry workflow
• Progressive data collection model

Backward Compatibility

• Existing hydrants with old format (MLT-###, ABC-001) remain unchanged
• New format only applies to newly created hydrants
• Both formats work in all features (maps, maintenance, testing)

Documentation

See HYDRANT_ADD_IMPROVEMENTS.md for complete technical documentation.

Screenshots

TODO: Add screenshots after testing in dev environment

Deployment Notes

1. Test in development environment first
2. Verify all three features work correctly
3. Check browser console for errors
4. Test on mobile devices for map picker UX
5. Merge to main after approval
6. Deploy to Railway/Netlify
7. Update user training documentation

Related Issues

Add issue numbers if applicable

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Ready for review! 🚀

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