feat(medical-action-src): add type code selection with strict typing

- Add medicalActionTypeCode constants and type definition
- Update MedicalActionSrc interface to use strict type for type_code
- Implement select dropdown for type code in entry form
- Enable type code validation in schema

app/models/medical-action-src.ts

@@ -1,9 +1,10 @@
 import { type Base, genBase } from './_base'
+import type { medicalActionTypeCodeKey } from '~/lib/constants'
 
 export interface MedicalActionSrc extends Base {
   code: string
   name: string
-  type_code: string
+  type_code: medicalActionTypeCodeKey
   item_id: number
 }