feat(tenancy): add member detail modal + fix invite name saving

Merchant team page:
- Consistent member display (full_name + email on every row)
- New view button (eye icon) on all members including owner
- View modal shows account info (username, role, email verified,
  last login, account created) and store memberships with roles
- API enriched with user metadata (username, role, is_email_verified,
  last_login, created_at)

Invite fix (both merchant and store routes):
- first_name and last_name from invite form were never passed to the
  service that creates the User account. Now passed through correctly.

i18n: 6 new keys across 4 locales (view_member, account_information,
username, email_verified, last_login, account_created).

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

app/modules/tenancy/services/merchant_store_service.py

@@ -504,9 +504,15 @@ class MerchantStoreService:
                     members_map[uid] = {
                         "user_id": uid,
                         "email": user.email,
+                        "username": user.username,
                         "first_name": user.first_name,
                         "last_name": user.last_name,
                         "full_name": f"{user.first_name or ''} {user.last_name or ''}".strip() or user.email,
+                        "role": user.role,
+                        "is_active": user.is_active,
+                        "is_email_verified": user.is_email_verified,
+                        "last_login": user.last_login.isoformat() if user.last_login else None,
+                        "created_at": user.created_at.isoformat() if user.created_at else None,
                         "stores": [],
                         "is_owner": uid == merchant.owner_user_id,
                     }

app/modules/tenancy/services/store_team_service.py

@@ -54,6 +54,8 @@ class StoreTeamService:
         inviter: User,
         email: str,
         role_name: str,
+        first_name: str | None = None,
+        last_name: str | None = None,
         custom_permissions: list[str] | None = None,
     ) -> dict[str, Any]:
         """
@@ -148,6 +150,8 @@ class StoreTeamService:
                     email=email,
                     username=username,
                     hashed_password=self.auth_manager.hash_password(temp_password),
+                    first_name=first_name,
+                    last_name=last_name,
                     role="store_member",
                     is_active=False,  # Will be activated when invitation accepted
                     is_email_verified=False,