Exteban08 71db4219ca Add CSV upload panel for meters and readings ...

- Add CSV upload service with upsert logic for meters
- Add CSV upload routes (POST /csv-upload/meters, POST /csv-upload/readings)
- Add template download endpoints for CSV format
- Create standalone upload-panel React app on port 5174
- Support concentrator_serial lookup for meter creation

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-02-03 11:08:30 +00:00

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