hotfix: use McpName from config schema instead of duplicate type definition

Author: code-yeongyu

src/mcp/index.ts

@@ -1,7 +1,8 @@
+import type { McpName } from "../config"
 import { websearch_exa } from "./websearch-exa"
 import { context7 } from "./context7"
 
-export type McpName = "websearch_exa" | "context7"
+export type { McpName }
 
 const allBuiltinMcps: Record<McpName, { type: "remote"; url: string; enabled: boolean }> = {
   websearch_exa,