feat: 设置页新增模型卡片，支持为7种能力配置默认模型

tests/server/routes/settings.test.ts

@@ -2,7 +2,7 @@ import type Database from "bun:sqlite";
 
 import { describe, expect, test } from "bun:test";
 
-import type { RuntimeMode } from "../../../src/shared/api";
+import type { RuntimeMode, SettingsData } from "../../../src/shared/api";
 
 import { createNoopLogger } from "../../../src/server/logger";
 import { createMigratedMemoryTestDatabase } from "../../helpers";
@@ -191,4 +191,48 @@ describe("设置 API 路由", () => {
       expect(body).toEqual({ compact: true, theme: "dark" });
     });
   });
+
+  test("PUT /api/settings 写入 defaultModels 后 GET 返回包含该字段", async () => {
+    await withRouteDb(async (db) => {
+      const putReq = new Request("http://localhost/api/settings", {
+        body: JSON.stringify({ defaultModels: { text: "model-1", imageRecognition: null } }),
+        headers: { "Content-Type": "application/json" },
+        method: "PUT",
+      });
+      const putRes = await updateSettingsViaHandler(putReq, db);
+      expect(putRes.status).toBe(200);
+      const putBody = (await putRes.json()) as SettingsData;
+      expect(putBody.defaultModels).toEqual({ text: "model-1", imageRecognition: null });
+      expect(putBody.compact).toBe(false);
+      expect(putBody.theme).toBe("system");
+
+      const getReq = new Request("http://localhost/api/settings");
+      const getRes = await getSettingsViaHandler(getReq, db);
+      expect(getRes.status).toBe(200);
+      const getBody = (await getRes.json()) as SettingsData;
+      expect(getBody.defaultModels).toEqual({ text: "model-1", imageRecognition: null });
+    });
+  });
+
+  test("PUT /api/settings defaultModels 与 theme 合并持久化不丢失", async () => {
+    await withRouteDb(async (db) => {
+      const req1 = new Request("http://localhost/api/settings", {
+        body: JSON.stringify({ theme: "dark" }),
+        headers: { "Content-Type": "application/json" },
+        method: "PUT",
+      });
+      await updateSettingsViaHandler(req1, db);
+
+      const req2 = new Request("http://localhost/api/settings", {
+        body: JSON.stringify({ defaultModels: { videoGeneration: "model-v" } }),
+        headers: { "Content-Type": "application/json" },
+        method: "PUT",
+      });
+      const res2 = await updateSettingsViaHandler(req2, db);
+      expect(res2.status).toBe(200);
+      const body = (await res2.json()) as SettingsData;
+      expect(body.theme).toBe("dark");
+      expect(body.defaultModels).toEqual({ videoGeneration: "model-v" });
+    });
+  });
 });