refactor: 简化客户端创建逻辑并明确泛型类型

- 更新客户端创建逻辑，明确指定泛型类型并简化导出方式。

src/orpc/client.ts

@@ -14,13 +14,13 @@ const getORPCClient = createIsomorphicFn()
       }),
     }),
   )
-  .client((): RouterClient<typeof router> => {
+  .client(() => {
     const link = new RPCLink({
       url: `${window.location.origin}/api/rpc`,
     })
-    return createORPCClient(link)
+    return createORPCClient<RouterClient<typeof router>>(link)
   })
 
-const client: RouterClient<typeof router> = getORPCClient()
+const client = getORPCClient()
 
 export const orpc = createTanstackQueryUtils(client)