fix(core): memfs should be dev dependency (#1946)

Author: chenjiahan

packages/core/package.json

@@ -68,7 +68,6 @@
     "htmr": "^1.0.2",
     "lodash-es": "^4.17.21",
     "mdast-util-mdxjs-esm": "^1.3.1",
-    "memfs": "^4.17.0",
     "picocolors": "^1.1.1",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
@@ -97,6 +96,7 @@
     "@types/node": "^18.11.17",
     "@types/react": "^18.3.18",
     "@types/react-dom": "^18.3.5",
+    "memfs": "^4.17.0",
     "postcss": "8.5.3",
     "rehype-stringify": "^9.0.4",
     "remark-parse": "^10.0.2",