Add /api/event creation endpoint with Calendar and Slack scheduling

[sogav21]

Fixes #48

Summary

• Adds POST /api/event behind the existing auth + write:event permission flow
• Creates a Google Calendar event in CALENDAR_CELEBRATION_ID and persists the resulting event metadata in the Event table
• Supports the requested event types: daily message, celebration, and meet
• Schedules Slack delivery for daily message events using node-schedule, saving ts_daily_message after posting
• Adds focused unit coverage for daily-message scheduling and Google Meet creation

Validation

• node --check api/src/controllers/eventControllers/createEvent.controller.js
• node --check api/src/controllers/eventControllers/index.js
• node --check api/src/routes/event.router.js
• node --check api/src/utils/schedule/scheduleDailyMessage.js
• npx jest --runTestsByPath tests/event.controller.spec.js --runInBand from api/

Note

The full existing API test suite still fails before reaching this change because the current tests target /api_student_v1/user/log-in and require real/fake Stytch + Slack configuration. The focused event controller tests pass.

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