feat(tenancy): add profile editing in merchant team edit modal

Edit modal now has editable first_name, last_name, email fields with
a "Save Profile" button, alongside the existing per-store role management.

New:
- PUT /merchants/account/team/members/{user_id}/profile endpoint
- MerchantTeamProfileUpdate schema
- update_team_member_profile() service method with ownership validation
- 2 new i18n keys across 4 locales (personal_info, save_profile)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/modules/tenancy/services/merchant_store_service.py

@@ -26,6 +26,7 @@ from app.modules.tenancy.models.merchant import Merchant
 from app.modules.tenancy.models.platform import Platform
 from app.modules.tenancy.models.store import Role, Store
 from app.modules.tenancy.models.store_platform import StorePlatform
+from app.modules.tenancy.models.user import User
 
 logger = logging.getLogger(__name__)
 
@@ -456,6 +457,58 @@ class MerchantStoreService:
             raise StoreNotFoundException(store_id, identifier_type="id")
         return store
 
+    def update_team_member_profile(
+        self,
+        db: Session,
+        merchant_id: int,
+        user_id: int,
+        update_data: dict,
+    ) -> None:
+        """
+        Update a team member's profile (first_name, last_name, email).
+
+        Validates that the user is a team member of one of the merchant's stores.
+        """
+        from app.modules.tenancy.models.store import StoreUser
+
+        # Verify user is a team member in at least one of the merchant's stores
+        stores = (
+            db.query(Store)
+            .filter(Store.merchant_id == merchant_id)
+            .all()
+        )
+        store_ids = [s.id for s in stores]
+
+        membership = (
+            db.query(StoreUser)
+            .filter(
+                StoreUser.store_id.in_(store_ids),
+                StoreUser.user_id == user_id,
+            )
+            .first()
+        )
+
+        if not membership:
+            # Also allow updating the owner
+            merchant = db.query(Merchant).filter(Merchant.id == merchant_id).first()
+            if not merchant or merchant.owner_user_id != user_id:
+                from app.modules.tenancy.exceptions import UserNotFoundException
+                raise UserNotFoundException(str(user_id))
+
+        user = db.query(User).filter(User.id == user_id).first()
+        if not user:
+            from app.modules.tenancy.exceptions import UserNotFoundException
+            raise UserNotFoundException(str(user_id))
+
+        if "first_name" in update_data:
+            user.first_name = update_data["first_name"]
+        if "last_name" in update_data:
+            user.last_name = update_data["last_name"]
+        if "email" in update_data and update_data["email"]:
+            user.email = update_data["email"]
+
+        db.flush()
+
     def get_merchant_team_members(self, db: Session, merchant_id: int) -> dict:
         """
         Get team members across all merchant stores in a member-centric view.