refactor(data): replace schema classes with readonly models

src/data/schemas/chat/chat_payloads.ts

@@ -3,11 +3,7 @@
  */
 import { z } from "zod";
 
-import {
-  booleanOrFalse,
-  schemaOr,
-  stringOrNull,
-} from "../nullable-defaults";
+import { booleanOrFalse, schemaOr, stringOrNull } from "../nullable-defaults";
 
 const CHAT_IMAGE_DEFAULTS = { type: null, url: null } as const;
 
@@ -22,7 +18,7 @@ export const ChatImageSchema = schemaOr(
     url: stringOrNull,
   }),
   CHAT_IMAGE_DEFAULTS,
-);
+).readonly();
 
 export const ChatLockDetailSchema = schemaOr(
   z.object({
@@ -30,7 +26,7 @@ export const ChatLockDetailSchema = schemaOr(
     reason: stringOrNull,
   }),
   CHAT_LOCK_DETAIL_DEFAULTS,
-);
+).readonly();
 
 export type ChatImageInput = z.input<typeof ChatImageSchema>;
 export type ChatImageData = z.output<typeof ChatImageSchema>;