refactor(address): update address models and forms to use standardized fields

- Add preload relationships to address-related models
- Rename postalCode to postalCode_code for consistency
- Simplify location type handling with hidden fields
- Update validation schemas and form components
- Improve address display in patient preview

app/models/district.ts

@@ -1,9 +1,13 @@
 import { type Base, genBase } from './_base'
+import type { Regency } from './regency'
 
 export interface District extends Base {
   regency_code: string
   code: string
   name: string
+
+  // preload
+  regency?: Regency | null
 }
 
 export function genDistrict(): District {