Add person email/phone, approve bulk select, and pending-queue digest

Capture optional contact fields on identify/approve, add Select All and
Approve Next 10 on User Identified Faces, and email admins when the
pending queue grows (ADMIN_NOTIFY_EMAIL via existing noreply SMTP).

backend/api/faces.py

@@ -324,6 +324,8 @@ def identify_face(
         last_name = (request.last_name or "").strip()
         middle_name = request.middle_name.strip() if request.middle_name else None
         maiden_name = request.maiden_name.strip() if request.maiden_name else None
+        email = request.email.strip() if request.email else None
+        phone = request.phone.strip() if request.phone else None
         if not (first_name and last_name):
             raise HTTPException(
                 status_code=status.HTTP_400_BAD_REQUEST,
@@ -336,6 +338,8 @@ def identify_face(
             middle_name=middle_name,
             maiden_name=maiden_name,
             date_of_birth=request.date_of_birth,
+            email=email,
+            phone=phone,
             created_date=datetime.utcnow(),
         )
         db.add(person)