Adds 4 REST endpoints under /api/v1/weather/:
- GET /weather/locations — 12 locations with latest stress, sorted by severity
- GET /weather/locations/<id> — daily series for one location (?metrics, ?days)
- GET /weather/stress — global daily stress trend (?days)
- GET /weather/alerts — locations with active crop stress flags
All endpoints use @api_key_required(scopes=["read"]) and return {"data": ...}.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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