add backend hatchet worker for calendar predue sync

docs/prisma-governance.md

@@ -2,18 +2,18 @@
 
 ## Single source of truth
 
-- Canonical Prisma schema: `Frontend/prisma/schema.prisma`.
+- Canonical Prisma schema: `frontend/prisma/schema.prisma`.
 - Service copy:
   - `backend/prisma/schema.prisma`
 
 ## Update flow
 
-1. Edit only `Frontend/prisma/schema.prisma`.
+1. Edit only `frontend/prisma/schema.prisma`.
 2. Run `./scripts/prisma-sync.sh`.
 3. Run `./scripts/prisma-check.sh`.
 4. Commit changed schema copy.
 
 ## Rollout policy
 
-- Schema rollout (`prisma db push` / migrations) is allowed only in `Frontend`.
+- Schema rollout (`prisma db push` / migrations) is allowed only in `frontend`.
 - `backend` must use generated Prisma client only.