Fix: Contact model has phone_2 not mobilephone — fix export+import service

app/services/import_export_service.py

@@ -1,6 +1,6 @@
 """Import/export service — CSV import with dry-run preview, CSV/XLSX export.
 
-Uses unified Contact model fields: firstname, surname, email_1, phone_1, mobilephone, function.
+Uses unified Contact model fields: firstname, surname, email_1, phone_1, phone_2, function.
 Company import creates Contact with type='company'.
 """
 
@@ -122,7 +122,7 @@ async def import_contacts(
     """Import contacts from CSV using unified Contact model fields.
 
     CSV columns: firstname, surname, email, phone, mobile, function, department.
-    Maps to Contact fields: firstname, surname, email_1, phone_1, mobilephone, function.
+    Maps to Contact fields: firstname, surname, email_1, phone_1, phone_2, function.
     """
     rows = _parse_csv(csv_content)
     total = len(rows)
@@ -161,7 +161,7 @@ async def import_contacts(
             displayname=f"{row['firstname']} {row['surname']}",
             email_1=row.get("email", "").strip() or None,
             phone_1=row.get("phone", "").strip() or None,
-            mobilephone=row.get("mobile", "").strip() or None,
+            phone_2=row.get("mobile", "").strip() or None,
             function=row.get("function", "").strip() or None,
             created_by=user_id,
             updated_by=user_id,
@@ -244,7 +244,7 @@ async def export_contacts_csv(
                 c.name or "",
                 c.email_1 or "",
                 c.phone_1 or "",
-                c.mobilephone or "",
+                c.phone_2 or "",
                 c.function or "",
                 c.mailing_city or "",
                 c.mailing_postalcode or "",