feat(chat): load model options from backend

src/lib/chatModels.test.ts

@@ -0,0 +1,65 @@
+import { fetchAgentModels } from "./chatModels";
+
+const apiFetch = jest.fn();
+
+jest.mock("@/lib/apiFetch", () => ({
+  apiFetch: (...args: unknown[]) => apiFetch(...args),
+}));
+
+describe("fetchAgentModels", () => {
+  beforeEach(() => {
+    apiFetch.mockReset();
+  });
+
+  it("loads model options and backend default model", async () => {
+    apiFetch.mockResolvedValueOnce({
+      ok: true,
+      json: async () => ({
+        default_model: "deepseek/deepseek-v4-flash",
+        models: [
+          {
+            id: "deepseek/deepseek-v4-flash",
+            label: "快速",
+            description: "快速回答和任务执行",
+            icon: "bolt",
+          },
+        ],
+      }),
+    });
+
+    await expect(fetchAgentModels()).resolves.toEqual({
+      defaultModel: "deepseek/deepseek-v4-flash",
+      models: [
+        {
+          id: "deepseek/deepseek-v4-flash",
+          label: "快速",
+          description: "快速回答和任务执行",
+          icon: "bolt",
+        },
+      ],
+    });
+    expect(apiFetch).toHaveBeenCalledWith(
+      expect.stringContaining("/api/v1/agent/chat/models"),
+      expect.objectContaining({
+        method: "GET",
+        projectHeaderMode: "include",
+        userHeaderMode: "include",
+        skipAuthRedirect: true,
+      }),
+    );
+  });
+
+  it("falls back to the first option when default model is omitted", async () => {
+    apiFetch.mockResolvedValueOnce({
+      ok: true,
+      json: async () => ({
+        models: [{ id: "provider/model", label: "Model" }],
+      }),
+    });
+
+    await expect(fetchAgentModels()).resolves.toEqual({
+      defaultModel: "provider/model",
+      models: [{ id: "provider/model", label: "Model" }],
+    });
+  });
+});