feat: reorganize admin panel around accounts

frontend/src/types/admin.ts

@@ -18,6 +18,60 @@ export interface ActivityEntry {
   created_at: string
 }
 
+export interface AdminUserListItem {
+  id: string
+  email: string
+  name: string
+  role: string
+  is_super_admin: boolean
+  is_active: boolean
+  account_id: string | null
+  account_role: string | null
+  account_name: string | null
+  account_display_code: string | null
+  created_at: string
+  last_login: string | null
+  deleted_at: string | null
+}
+
+export interface AdminUserListResponse {
+  items: AdminUserListItem[]
+  total: number
+  page: number
+  per_page: number
+}
+
+export interface AdminAccountMember {
+  id: string
+  email: string
+  name: string
+  role: string
+  is_super_admin: boolean
+  is_active: boolean
+  account_role: string | null
+  created_at: string
+  last_login: string | null
+  deleted_at: string | null
+}
+
+export interface AdminAccountListItem {
+  id: string
+  name: string
+  display_code: string
+  created_at: string
+  owner_id: string | null
+  member_count: number
+  active_member_count: number
+  members: AdminAccountMember[]
+}
+
+export interface AdminAccountListResponse {
+  items: AdminAccountListItem[]
+  total: number
+  page: number
+  per_page: number
+}
+
 export interface AuditLogEntry {
   id: string
   user_id: string