users: tabla + sync detalle + lookups para roles/companies

- db.ts v6: tablas users + lookups con schema
- users-db.ts: CRUD users + lookups
- user-sync.ts: fetch /api/users/{id}/ con concurrencia 5
- kappa-api.ts: +getUserDetail(id)
- users store: +syncDetails() con progreso + mapeo roleId→name
- UsersView: boton 'Sincronizar roles' con progreso
- UserRecord: username, isStaff, phone, position, lastActive, createdAt

src/services/kappa-api.ts

@@ -99,6 +99,10 @@ class KappaAPI {
     return this.request<unknown[]>('GET', '/users/all/')
   }
 
+  async getUserDetail(id: number): Promise<Record<string, unknown>> {
+    return this.request<Record<string, unknown>>('GET', `/users/${id}/`)
+  }
+
   async getEmployees(page = 1): Promise<PaginatedResponse<KappaEmployee>> {
     return this.request<PaginatedResponse<KappaEmployee>>('GET', `/employees/?page=${page}`)
   }