Set up error monitoring with Sentry

[raggopaluni]

Description

Know when something breaks before a neighbor tells you.

Tool: Sentry (free tier)

Setup:

1. sentry.io → free account
2. Create 2 projects: neighborpickd-web, neighborpickd-api
3. Add Sentry SDK to React
4. Add Sentry SDK to FastAPI
5. Email alerts on new errors

Prod only — not dev.

Acceptance Criteria

• Frontend errors in Sentry
• API errors in Sentry
• Email alert on new error type
• Working in prod only
• No sensitive data in logs

Dependencies

Issues #3, #4