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/routes/api/merchant.py

@@ -25,7 +25,10 @@ from app.modules.tenancy.schemas import (
     MerchantStoreUpdate,
 )
 from app.modules.tenancy.schemas.auth import UserContext
-from app.modules.tenancy.schemas.team import MerchantTeamInvite
+from app.modules.tenancy.schemas.team import (
+    MerchantTeamInvite,
+    MerchantTeamProfileUpdate,
+)
 from app.modules.tenancy.services.merchant_service import merchant_service
 from app.modules.tenancy.services.merchant_store_service import merchant_store_service
 
@@ -252,6 +255,26 @@ async def merchant_team_invite(
     )
 
 
+@_account_router.put("/team/members/{user_id}/profile")
+async def merchant_team_update_profile(
+    user_id: int,
+    data: MerchantTeamProfileUpdate,
+    current_user: UserContext = Depends(get_current_merchant_api),
+    merchant=Depends(get_merchant_for_current_user),
+    db: Session = Depends(get_db),
+):
+    """Update a team member's profile (first name, last name, email)."""
+    merchant_store_service.update_team_member_profile(
+        db, merchant.id, user_id, data.model_dump(exclude_unset=True)
+    )
+    db.commit()
+    logger.info(
+        f"Merchant {merchant.id} updated profile for user {user_id} "
+        f"by {current_user.username}"
+    )
+    return {"message": "Profile updated successfully"}
+
+
 @_account_router.put("/team/stores/{store_id}/members/{user_id}")
 async def merchant_team_update_role(
     store_id: int,