feat(unit-position): implement crud operations and update ui components

- Add new handler, service, and schema files for unit-position
- Update list configuration and entry form components
- Modify page title and integrate employee relation
- Implement CRUD operations with proper validation

app/models/unit-position.ts

@@ -1,4 +1,5 @@
 import { type Base, genBase } from './_base'
+import type { Employee } from './employee'
 
 export interface UnitPosition extends Base {
   unit_id: number
@@ -6,6 +7,8 @@ export interface UnitPosition extends Base {
   name: string
   headStatus?: boolean
   employee_id?: number
+
+  employee?: Employee | null
 }
 
 export function genUnitPosition(): UnitPosition {