chore: add missing package.json export to server package (#700)

Author: ymc9

packages/server/package.json

@@ -62,6 +62,7 @@
         "typescript": "^4.9.4"
     },
     "exports": {
+        "./package.json": "./package.json",
         "./api/rest": "./api/rest/index.js",
         "./api/rpc": "./api/rpc/index.js",
         "./express": "./express/index.js",