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/lib/constants.ts

@@ -268,3 +268,13 @@ export const infraGroupCodesKeys: Record<string, string> = Object.keys(infraGrou
   },
   {} as Record<string, string>,
 )
+
+export const medicalActionTypeCode: Record<string, string> = {
+  chemo: 'Chemo',
+  hemo: 'Hemo',
+  thalasemia: 'Thalasemia',
+  echocardio: 'Echocardiography',
+  spirometry: 'Spirometry',
+} as const
+
+export type medicalActionTypeCodeKey = keyof typeof medicalActionTypeCode