Summary

• Adds Lever ATS (Applicant Tracking System) integration using Merge.dev unified API
• Implements CRM interface for candidate management and activity logging
• OAuth flow via Merge.dev Link for secure authentication

What’s included

• OAuth flow: /api/add.ts creates Merge Link token, /api/callback.ts exchanges public token for account token
• CRM Service: lib/CrmService.ts implements full CRM interface:
  • createContacts() - Create candidates in Lever
  • getContacts() - Search candidates by email
  • createEvent() - Log meeting activities as notes on candidates
  • updateEvent() / deleteEvent() - Stubbed (Merge ATS API limitation)
• Configuration: Proper metadata, config.json, and exports

Test plan

• Set MERGE_API_KEY environment variable
• Install app from App Store
• Complete Merge.dev Link OAuth flow
• Verify credential stored in database
• Create booking with attendee email
• Verify candidate/activity created in Lever

Fixes #3717

/claim #3717