Test: verify earnings collection scheduler and startup trigger

[GeiserX]

Context

CashPilot collects earnings on a configurable interval (default: 3600s) using APScheduler, and also triggers a collection run immediately on container startup.

Task

1. Verify the scheduler is configured with the correct interval from CASHPILOT_COLLECTION_INTERVAL
2. Verify the startup trigger fires a collection run
3. Verify collection results are stored in the database
4. Mock collector HTTP calls to avoid hitting real APIs

Reference

• app/main.py — scheduler setup, startup collection
• app/collectors/ — collector implementations
• app/database.py — earnings storage