New endpoints:
- GET /api/v1/version — returns VERSIONS.json (no auth required)
For field engineers to check platform version from login page
- GET /api/v1/kpi/solar — returns PR, self-consumption rate,
equivalent utilization hours, and daily revenue
Handles station-level vs device-level data deduplication
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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