ESA Proxy Worker

Endpoints:
- GET /incidents
- GET /incident-status (lightweight change check)
- GET /fire-danger
- GET /bom-warnings
- GET /ed-wait-times
- GET /power-outages
- GET /nsw-fires
- GET /earthquakes
- GET /nsw-air-quality
- GET /bushfire-history (historical bushfire boundaries)
- GET /tiles/{z}/{x}/{y}.png (OSM tile proxy)
- GET /vapid-key
- POST /subscribe
- POST /unsubscribe