fix: 模型管理审查修复与归档

- 修复 registry 测试 ai mock 缺失 createProviderRegistry 导出
- 新增 POST /api/providers/test 支持未保存供应商配置连通性测试
- 供应商表单新增测试连接按钮，新建默认 openai-compatible
- 连通性测试按 ok 展示成功/失败，不再统一 success 样式
- 模型表单新建时也可测试供应商连接
- 模型页使用独立 provider 列表避免分页/搜索影响
- 移除模型管理组件内联 style
- 新增 ProviderTestResultResponse 共享响应类型
- 新增 bun run format:check 脚本
- 补充关键测试覆盖（删除关联、连通性、默认类型、表单测试）
- 更新 docs/user/usage.md、docs/development/*、design.md、tasks.md
- 归档 change 至 openspec/changes/archive/2026-05-29-add-model-management

tests/web/hooks/use-providers.test.ts

@@ -7,6 +7,7 @@ import {
   enableProvider,
   fetchProvider,
   fetchProviderList,
+  testProviderConfig,
   testProviderConnection,
   updateProvider,
 } from "../../../src/web/hooks/use-providers";
@@ -89,6 +90,27 @@ describe("use-providers request helpers", () => {
     expect(result).toEqual({ message: "ok", ok: true });
   });
 
+  test("testProviderConfig posts form config and parses response", async () => {
+    const calls = installFetchMock(() => jsonResponse({ providerTestResponse: { message: "ok", ok: true } }));
+
+    const result = await testProviderConfig({
+      apiKey: "sk-test",
+      baseUrl: "https://api.openai.com/v1",
+      name: "OpenAI",
+      type: "openai-compatible",
+    });
+
+    expect(result).toEqual({ message: "ok", ok: true });
+    expect(calls[0]?.method).toBe("POST");
+    expect(calls[0]?.url).toBe("/api/providers/test");
+    expect(jsonBody(calls[0]?.body)).toEqual({
+      apiKey: "sk-test",
+      baseUrl: "https://api.openai.com/v1",
+      name: "OpenAI",
+      type: "openai-compatible",
+    });
+  });
+
   test("error response uses backend error field", async () => {
     installFetchMock(() => jsonResponse({ error: "dup" }, { status: 409 }));