feat(users): automatically send the set-password email on user creation

Admin used to have to click 'Send Email' separately after creating a
passwordless user. Now the first set-password email is sent right away
as part of creation — best-effort: if the webhook isn't configured or
the send fails, the user is still created successfully, and the existing
'Send Email' button remains available to retry with proper error
surfacing.

backend/app/routers/users.py

@@ -1,5 +1,8 @@
 """User management router (admin only)."""
 
+# Import logging
+import logging
+
 # Import uuid
 import uuid
 
@@ -47,6 +50,8 @@ from app.services.password_setup_service import send_password_setup_email
 # Assign router = APIRouter(prefix="/users", tags=["users"])
 router = APIRouter(prefix="/users", tags=["users"])
 
+logger = logging.getLogger(__name__)
+
 
 # ---------------------------------------------------------------------------
 # PATCH /users/me/preferences  —  update current user preferences
@@ -187,6 +192,17 @@ def create_user_route(
     # Reload ORM object attributes from the database
     db.refresh(user)
 
+    # Send the set-password email right away — best-effort. If the webhook
+    # isn't configured or rejects the request, the user is still created
+    # successfully; the admin can retry via the "Send Email" button, which
+    # surfaces the failure properly (unlike this automatic first attempt).
+    try:
+        with UnitOfWork(db) as uow:
+            send_password_setup_email(db, user)
+            uow.commit()
+    except Exception:
+        logger.warning("Automatic set-password email failed for new user %s", user.id, exc_info=True)
+
     from app.services.notification_service import notify_roles_by_email
     notify_roles_by_email(
         db, roles=["admin"],