feat(subspecialist-position): implement crud operations for subspecialist positions

- Add new handler, service, and schema files for subspecialist position
- Update list configuration and entry form components
- Modify list view to display subspecialist position data
- Include subspecialist relation in position model

app/models/subspecialist-position.ts

@@ -1,5 +1,6 @@
 import { type Base, genBase } from './_base'
 import type { Employee } from './employee'
+import type { Subspecialist } from './subspecialist'
 
 export interface SubSpecialistPosition extends Base {
   subspecialist_id: number
@@ -8,6 +9,7 @@ export interface SubSpecialistPosition extends Base {
   headStatus?: boolean
   employee_id?: number
 
+  subspecialist?: Subspecialist | null
   employee?: Employee | null
 }