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

src/shared/api.ts

@@ -3,11 +3,32 @@ export interface ApiErrorResponse {
   status: number;
 }
 
+export interface CreateModelRequest {
+  capabilities: ModelCapability[];
+  contextLength?: null | number;
+  maxOutputTokens?: null | number;
+  modelId: string;
+  name: string;
+  providerId: string;
+}
+
 export interface CreateProjectRequest {
   description?: string;
   name: string;
 }
 
+// ==========================================
+// 在此定义你的业务类型
+// 前后端共享的类型都放在这个文件中
+// ==========================================
+
+export interface CreateProviderRequest {
+  apiKey: string;
+  baseUrl: string;
+  name: string;
+  type: ProviderType;
+}
+
 export interface MetaResponse {
   ok: true;
   service: string;
@@ -15,10 +36,50 @@ export interface MetaResponse {
   version: string;
 }
 
-// ==========================================
-// 在此定义你的业务类型
-// 前后端共享的类型都放在这个文件中
-// ==========================================
+export interface Model {
+  capabilities: ModelCapability[];
+  contextLength: null | number;
+  createdAt: string;
+  enabled: boolean;
+  id: string;
+  maxOutputTokens: null | number;
+  modelId: string;
+  name: string;
+  providerId: string;
+  updatedAt: string;
+}
+
+export type ModelCapability =
+  | "audio-generation"
+  | "audio-recognition"
+  | "image-generation"
+  | "image-recognition"
+  | "reasoning"
+  | "text"
+  | "video-generation"
+  | "video-recognition";
+
+export const MODEL_CAPABILITIES: readonly ModelCapability[] = [
+  "audio-generation",
+  "audio-recognition",
+  "image-generation",
+  "image-recognition",
+  "reasoning",
+  "text",
+  "video-generation",
+  "video-recognition",
+];
+
+export interface ModelListResponse {
+  items: Model[];
+  page: number;
+  pageSize: number;
+  total: number;
+}
+
+export interface ModelResponse {
+  model: Model;
+}
 
 export interface Project {
   archivedAt: null | string;
@@ -43,9 +104,54 @@ export interface ProjectResponse {
 
 export type ProjectStatus = "active" | "archived";
 
+export interface Provider {
+  apiKey: string;
+  baseUrl: string;
+  createdAt: string;
+  enabled: boolean;
+  id: string;
+  name: string;
+  type: ProviderType;
+  updatedAt: string;
+}
+
+export interface ProviderListResponse {
+  items: Provider[];
+  page: number;
+  pageSize: number;
+  total: number;
+}
+
+export interface ProviderResponse {
+  provider: Provider;
+}
+
+export interface ProviderTestResponse {
+  message: string;
+  ok: boolean;
+}
+
+export type ProviderType = "anthropic" | "openai" | "openai-compatible";
+
 export type RuntimeMode = "development" | "production" | "test";
 
+export interface UpdateModelRequest {
+  capabilities?: ModelCapability[];
+  contextLength?: null | number;
+  maxOutputTokens?: null | number;
+  modelId?: string;
+  name?: string;
+  providerId?: string;
+}
+
 export interface UpdateProjectRequest {
   description?: string;
   name?: string;
 }
+
+export interface UpdateProviderRequest {
+  apiKey?: string;
+  baseUrl?: string;
+  name?: string;
+  type?: ProviderType;
+}