feat: 新增模型管理功能（供应商 + 模型 CRUD）

- 新增 providers/models 数据库表、迁移和数据访问层
- 新增 15 个后端 API 路由（供应商/模型 CRUD + 连通性测试）
- 新增 AI 服务层（registry.ts: buildProviderRegistry + testProviderConnection）
- 新增前端模型管理页面（Tabs: 供应商/模型，含表格、表单、工具栏）
- 新增前端 hooks（use-providers, use-models）
- 新增共享类型和 MODEL_CAPABILITIES 常量
- 新增 10 个测试文件（66 个测试用例，4 个因 bun test ESM 兼容问题待修复）
- 更新开发文档（architecture, backend, frontend）
- 附带 apply-review 修复：统一错误响应、提取共享常量、清理重复测试

注意：registry.test.ts 中 4 个测试因 bun test 无法解析
createProviderRegistry ESM 导出而失败，详情见 context.md

tests/web/components/ModelTable.test.tsx

@@ -0,0 +1,115 @@
+import { fireEvent, screen, waitFor } from "@testing-library/react";
+import { describe, expect, mock, test } from "bun:test";
+import { createElement } from "react";
+
+import type { Model, Provider } from "../../../src/shared/api";
+
+import { ModelTable } from "../../../src/web/pages/models/components/ModelTable";
+import { renderWithProviders } from "../test-utils";
+
+const ENABLED_PROVIDER: Provider = {
+  apiKey: "sk-test",
+  baseUrl: "https://api.openai.com/v1",
+  createdAt: "2024-01-01T00:00:00.000Z",
+  enabled: true,
+  id: "pv1",
+  name: "OpenAI",
+  type: "openai",
+  updatedAt: "2024-01-01T00:00:00.000Z",
+};
+
+const DISABLED_PROVIDER: Provider = {
+  apiKey: "sk-off",
+  baseUrl: "https://api.deepseek.com/v1",
+  createdAt: "2024-01-01T00:00:00.000Z",
+  enabled: false,
+  id: "pv2",
+  name: "DeepSeek",
+  type: "openai-compatible",
+  updatedAt: "2024-01-01T00:00:00.000Z",
+};
+
+const ENABLED_MODEL: Model = {
+  capabilities: ["text", "reasoning"],
+  contextLength: 128000,
+  createdAt: "2024-01-01T00:00:00.000Z",
+  enabled: true,
+  id: "m1",
+  maxOutputTokens: 4096,
+  modelId: "gpt-4o",
+  name: "GPT-4o",
+  providerId: "pv1",
+  updatedAt: "2024-01-01T00:00:00.000Z",
+};
+
+const DISABLED_MODEL: Model = {
+  capabilities: ["text"],
+  contextLength: null,
+  createdAt: "2024-01-01T00:00:00.000Z",
+  enabled: false,
+  id: "m2",
+  maxOutputTokens: null,
+  modelId: "deepseek-chat",
+  name: "DeepSeek Chat",
+  providerId: "pv2",
+  updatedAt: "2024-01-01T00:00:00.000Z",
+};
+
+function clickLatestConfirmButton() {
+  const buttons = screen.getAllByRole("button", { name: /OK|确定/ });
+  fireEvent.click(buttons[buttons.length - 1]!);
+}
+
+describe("ModelTable", () => {
+  test("渲染模型表格数据", () => {
+    renderWithProviders(
+      createElement(ModelTable, {
+        data: { items: [ENABLED_MODEL, DISABLED_MODEL], page: 1, pageSize: 20, total: 2 },
+        loading: false,
+        onDelete: () => Promise.resolve(),
+        onDisable: () => Promise.resolve(),
+        onEdit: () => undefined,
+        onEnable: () => Promise.resolve(),
+        onPageChange: () => undefined,
+        page: 1,
+        pageSize: 20,
+        providers: [ENABLED_PROVIDER, DISABLED_PROVIDER],
+      }),
+    );
+
+    expect(screen.getByText("GPT-4o")).not.toBeNull();
+    expect(screen.getByText("gpt-4o")).not.toBeNull();
+    expect(screen.getByText("DeepSeek Chat")).not.toBeNull();
+  });
+
+  test("模型表格操作触发 enable/disable/delete", async () => {
+    const onDisable = mock(() => Promise.resolve());
+    const onEnable = mock(() => Promise.resolve());
+    const onDelete = mock(() => Promise.resolve());
+
+    renderWithProviders(
+      createElement(ModelTable, {
+        data: { items: [ENABLED_MODEL, DISABLED_MODEL], page: 1, pageSize: 20, total: 2 },
+        loading: false,
+        onDelete,
+        onDisable,
+        onEdit: () => undefined,
+        onEnable,
+        onPageChange: () => undefined,
+        page: 1,
+        pageSize: 20,
+        providers: [ENABLED_PROVIDER, DISABLED_PROVIDER],
+      }),
+    );
+
+    const disableButtons = screen.getAllByRole("button", { name: /禁用/ });
+    fireEvent.click(disableButtons[0]!);
+    await waitFor(() => expect(screen.getByText("确认禁用此模型？")).not.toBeNull());
+    clickLatestConfirmButton();
+    await waitFor(() => expect(onDisable).toHaveBeenCalledWith("m1"));
+
+    const enableButtons = screen.getAllByRole("button", { name: /启用/ });
+    fireEvent.click(enableButtons[0]!);
+    await waitFor(() => expect(onEnable).toHaveBeenCalledWith("m2"));
+  });
+});