feat: implement multi-tenant member management and UI improvements

- Add multi-tenant support (isAddTenant, isRemoveTenant) to backend UpdateUser API.
- Update UserRepository to support searching in company_codes array.
- Implement table sorting and align search bar layout in adminfront.
- Add 'Assign Existing Member' and 'Exclude from Organization' features to TenantUsersPage.
- Auto-populate tenantSlug in UserCreatePage via query parameters.
- Add necessary localization keys for new UI elements.

Resolves #644, #639, #642, #641

adminfront/src/locales/en.toml

@@ -1176,14 +1176,49 @@ primary = "Representative Affiliated Tenant"
 title = "Affiliation & Organization Info"
 
 [ui.admin.users.list]
-add = "User Add"
+add = "Add User"
+add_to_tenant = "Add to Tenant"
 bulk_import = "Bulk Import"
-empty = "Empty"
-fetch_error = "Fetch Error"
-search_placeholder = "Search Placeholder"
-subtitle = "Subtitle"
+empty = "No users found."
+fetch_error = "Failed to fetch user list."
+search_label = "Search Users"
+search_placeholder = "Search by name or email..."
+subtitle = "View and manage system users."
 toggle_status = "{{name}} active status"
-title = "User Manage"
+title = "User Management"
+
+[msg.admin.users]
+add_tenant_confirm = "Are you sure you want to add '{{name}}' to '{{tenant}}' tenant?"
+add_tenant_error = "An error occurred while adding the tenant."
+add_tenant_success = "Successfully added to the tenant."
+export_error = "Failed to export users."
+status_error = "Failed to change user status."
+self_delete_blocked = "You cannot delete your own account."
+
+[ui.admin.tenants.members]
+add_existing = "Assign Existing Member"
+create_new = "Create New Member"
+remove = "Exclude from Organization"
+title = "Tenant Members ({{count}})"
+view_profile = "View Profile"
+
+[ui.admin.tenants.members.table]
+actions = "ACTIONS"
+email = "EMAIL"
+name = "NAME"
+role = "ROLE"
+status = "STATUS"
+
+[msg.admin.tenants.members]
+empty = "No members in this organization."
+remove_confirm = "Are you sure you want to exclude '{{name}}' from this organization?"
+remove_error = "An error occurred while excluding from organization."
+remove_success = "Successfully excluded from organization."
+
+[ui.admin.tenants.list]
+search_label = "Search Tenants"
+search_placeholder = "Search by name or slug..."
+title = "Tenant List"
 
 [ui.admin.users.list.breadcrumb]
 list = "List"

adminfront/src/locales/ko.toml

@@ -1179,14 +1179,49 @@ title = "소속 및 조직 정보"
 
 [ui.admin.users.list]
 add = "사용자 추가"
+add_to_tenant = "테넌트에 추가"
 bulk_import = "일괄 임포트"
 empty = "검색 결과가 없습니다."
 fetch_error = "사용자 목록 조회에 실패했습니다."
+search_label = "사용자 검색"
 search_placeholder = "이름 또는 이메일 검색..."
 subtitle = "시스템 사용자를 조회하고 관리합니다."
 toggle_status = "{{name}} 활성 상태"
 title = "사용자 관리"
 
+[msg.admin.users]
+add_tenant_confirm = "'{{name}}'님을 '{{tenant}}' 테넌트에 추가하시겠습니까?"
+add_tenant_error = "테넌트 추가 중 오류가 발생했습니다."
+add_tenant_success = "해당 테넌트에 추가되었습니다."
+export_error = "사용자 내보내기에 실패했습니다."
+status_error = "사용자 상태 변경에 실패했습니다."
+self_delete_blocked = "본인 계정은 삭제할 수 없습니다."
+
+[ui.admin.tenants.members]
+add_existing = "기존 멤버 배정"
+create_new = "신규 멤버 생성"
+remove = "조직에서 제외"
+title = "테넌트 멤버 ({{count}})"
+view_profile = "상세 정보"
+
+[ui.admin.tenants.members.table]
+actions = "ACTIONS"
+email = "EMAIL"
+name = "NAME"
+role = "ROLE"
+status = "STATUS"
+
+[msg.admin.tenants.members]
+empty = "소속된 사용자가 없습니다."
+remove_confirm = "'{{name}}'님을 이 조직에서 제외하시겠습니까?"
+remove_error = "조직에서 제외하는 중 오류가 발생했습니다."
+remove_success = "조직에서 제외되었습니다."
+
+[ui.admin.tenants.list]
+search_label = "테넌트 검색"
+search_placeholder = "테넌트 이름 또는 슬러그 검색..."
+title = "테넌트 목록"
+
 [ui.admin.users.list.breadcrumb]
 list = "List"
 section = "Users"