fix: add tree select subspecialist and filter doctor

app/models/specialist.ts

@@ -1,9 +1,11 @@
 import { type Base, genBase } from "./_base"
+import type { Subspecialist } from "./subspecialist"
 
 export interface Specialist extends Base {
   code: string
   name: string
   unit_id?: number | string | null
+  subspecialists?: Subspecialist[]
 }
 
 export function genSpecialist(): Specialist {