core: send: 区分远端错误与本地错误

packages/hydrooj/package.json

@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.18.1",
+    "version": "2.18.2",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",
@@ -61,4 +61,4 @@
         "build": "tsc",
         "build:watch": "tsc --watch"
     }
-}
+}