feat: Python upstream — onboard/offboard, mailbox, Projects, --no-cache

Python changes that were ported to Rust in preceding commits:
- User onboard/offboard with mailbox + Projects provisioning
- Welcome email with job title/department
- --no-cache build flag
- Date validation, apply confirmation, build targets

sunbeam/services.py

@@ -22,6 +22,7 @@ SERVICES_TO_RESTART = [
     ("lasuite",  "people-frontend"),
     ("lasuite",  "people-celery-worker"),
     ("lasuite",  "people-celery-beat"),
+    ("lasuite",  "projects"),
     ("matrix",   "tuwunel"),
     ("media",    "livekit-server"),
 ]