feat(core): 将 Tavily API Key 从环境变量迁移到系统配置

- 新增 ServiceConfig 类型和 services 配置字段
- 添加 getServiceApiKey/saveServiceConfig/deleteServiceConfig API
- 更新 web_search 和 web_extract 工具使用配置系统
- 新增 /api/services REST 端点管理第三方服务配置

packages/core/src/provider/config.ts

@@ -7,7 +7,7 @@
 import { existsSync } from 'node:fs';
 import { readFile, writeFile, mkdir } from 'node:fs/promises';
 import { join } from 'node:path';
-import type { ProvidersConfigFile, CustomProviderDefinition, ProviderConfig } from './types.js';
+import type { ProvidersConfigFile, CustomProviderDefinition, ProviderConfig, ServiceConfig, ServiceType } from './types.js';
 import { getConfigDir as getGlobalConfigDir } from '../constants/paths.js';
 
 /** 配置文件名 */
@@ -28,7 +28,7 @@ export async function loadProvidersConfig(): Promise<ProvidersConfigFile> {
   const configPath = getConfigPath();
 
   if (!existsSync(configPath)) {
-    return { providers: {}, configs: {} };
+    return { providers: {}, configs: {}, services: {} };
   }
 
   try {
@@ -37,10 +37,11 @@ export async function loadProvidersConfig(): Promise<ProvidersConfigFile> {
     return {
       providers: config.providers ?? {},
       configs: config.configs ?? {},
+      services: config.services ?? {},
     };
   } catch {
     // 解析失败返回空配置
-    return { providers: {}, configs: {} };
+    return { providers: {}, configs: {}, services: {} };
   }
 }
 
@@ -83,3 +84,43 @@ export function mergeProviderConfig(
     enabled: config?.enabled ?? true,
   };
 }
+
+/**
+ * 获取服务配置
+ */
+export async function getServiceConfig(serviceId: ServiceType): Promise<ServiceConfig | undefined> {
+  const config = await loadProvidersConfig();
+  return config.services?.[serviceId];
+}
+
+/**
+ * 获取服务 API Key
+ */
+export async function getServiceApiKey(serviceId: ServiceType): Promise<string | undefined> {
+  const serviceConfig = await getServiceConfig(serviceId);
+  if (serviceConfig?.enabled === false) {
+    return undefined;
+  }
+  return serviceConfig?.apiKey;
+}
+
+/**
+ * 保存服务配置
+ */
+export async function saveServiceConfig(serviceId: ServiceType, serviceConfig: Omit<ServiceConfig, 'id'>): Promise<void> {
+  const config = await loadProvidersConfig();
+  config.services = config.services ?? {};
+  config.services[serviceId] = { ...serviceConfig, id: serviceId };
+  await saveProvidersConfig(config);
+}
+
+/**
+ * 删除服务配置
+ */
+export async function deleteServiceConfig(serviceId: ServiceType): Promise<void> {
+  const config = await loadProvidersConfig();
+  if (config.services) {
+    delete config.services[serviceId];
+    await saveProvidersConfig(config);
+  }
+}

packages/core/src/provider/index.ts

@@ -19,6 +19,8 @@ export type {
   ProvidersConfigFile,
   ProviderListItem,
   ProviderDetail,
+  ServiceConfig,
+  ServiceType,
 } from './types.js';
 
 // Registry
@@ -42,6 +44,10 @@ export {
   saveProvidersConfig,
   resolveApiKey,
   getConfigPath,
+  getServiceConfig,
+  getServiceApiKey,
+  saveServiceConfig,
+  deleteServiceConfig,
 } from './config.js';
 
 // Utils

packages/core/src/provider/types.ts

@@ -122,8 +122,23 @@ export interface ProvidersConfigFile {
   providers?: Record<string, CustomProviderDefinition>;
   /** 提供商配置（API Key、选项等） */
   configs?: Record<string, ProviderConfig>;
+  /** 第三方服务配置（如 Tavily） */
+  services?: Record<string, ServiceConfig>;
 }
 
+/** 第三方服务配置 */
+export interface ServiceConfig {
+  /** 服务 ID */
+  id: string;
+  /** API Key */
+  apiKey?: string;
+  /** 是否启用 */
+  enabled?: boolean;
+}
+
+/** 已知的服务类型 */
+export type ServiceType = 'tavily';
+
 /** 提供商列表项（API 响应用） */
 export interface ProviderListItem {
   id: string;