refactor(data): replace schema classes with readonly models

src/data/schemas/user/__tests__/user.test.ts

@@ -1,11 +1,11 @@
 import { describe, expect, it } from "vitest";
 
-import { UserEntitlements } from "@/data/schemas/user";
-import { User } from "@/data/schemas/user/user";
+import { UserEntitlementsSchema } from "@/data/schemas/user";
+import { UserSchema } from "@/data/schemas/user/user";
 
 describe("User", () => {
   it("parses the latest backend user payload", () => {
-    const user = User.fromJson({
+    const user = UserSchema.parse({
       id: "d7bb2b3d-e9c5-474c-85fe-f503048f30dd",
       username: "guest_bbc90a38",
       email: "device_bbc90a38b996187348f54cf2cb0b789e@guest.local",
@@ -45,7 +45,7 @@ describe("User", () => {
       lastMessageAt: "2026-06-24T11:00:23.156561+00:00",
     });
 
-    expect(user.toJson()).toEqual({
+    expect(user).toEqual({
       id: "d7bb2b3d-e9c5-474c-85fe-f503048f30dd",
       username: "guest_bbc90a38",
       email: "device_bbc90a38b996187348f54cf2cb0b789e@guest.local",
@@ -75,17 +75,17 @@ describe("User", () => {
       lastMessageAt: "2026-06-24T11:00:23.156561+00:00",
     });
 
-    expect("dailyQuotas" in user.toJson()).toBe(false);
+    expect("dailyQuotas" in user).toBe(false);
   });
 
   it("defaults nullable nested user fields through schema helpers", () => {
-    const user = User.fromJson({
+    const user = UserSchema.parse({
       id: "user-1",
       username: "guest_user",
       personalityTraits: null,
     });
 
-    expect(user.personalityTraits.toJson()).toEqual({
+    expect(user.personalityTraits).toEqual({
       caring: 0.5,
       playful: 0.5,
       serious: 0.5,
@@ -95,7 +95,7 @@ describe("User", () => {
   });
 
   it("parses the latest backend entitlements payload", () => {
-    const entitlements = UserEntitlements.fromJson({
+    const entitlements = UserEntitlementsSchema.parse({
       userId: "user-1",
       isGuest: false,
       isVip: true,
@@ -142,7 +142,7 @@ describe("User", () => {
   });
 
   it("defaults nullable entitlement sections through schema helpers", () => {
-    const entitlements = UserEntitlements.fromJson({
+    const entitlements = UserEntitlementsSchema.parse({
       userId: "user-1",
       policy: null,
       costs: null,