Enhanced services module with comprehensive consumption tracking:
- Add usage field to ServiceBill interface (optional number)
- Add unit field to ServiceBill interface (kW, m³, or empty for internet)
- Updated AddServiceModal with consumption input field
- Auto-detect unit based on service type (electricity=kW, gas/water=m³, internet=none)
- Responsive grid layout for amount and consumption inputs
- Display consumption and unit in history list
- Show price per unit in history (amount/usage)
- Improved date display with responsive layout
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