LICENSE: 回退至 AGPL-v3 以避免可能出现的法律问题

https://github.com/monyhar/monyhar-lite/pull/9#issuecomment-860389913
证书大师！%%%

packages/hydrooj/package.json

@@ -6,7 +6,7 @@
     "typings": "dist/loader.d.ts",
     "repository": "https://github.com/hydro-dev/Hydro.git",
     "author": "undefined <i@undefined.moe>",
-    "license": "SEE LICENSE IN LICENSE",
+    "license": "AGPL-3.0-or-later",
     "engines": {
         "node": ">=14"
     },