⬆️(dependency) upgrade eslint to v9

We upgraded ESLint to version 9 in the
eslint-config-impress package.
We rename it to eslint-plugin-docs.

src/frontend/packages/eslint-plugin-docs/package.json

@@ -0,0 +1,34 @@
+{
+  "name": "eslint-plugin-docs",
+  "version": "3.6.0",
+  "license": "MIT",
+  "main": "index.js",
+  "keywords": [
+    "eslint",
+    "eslintplugin",
+    "eslint-plugin"
+  ],
+  "scripts": {
+    "lint": "eslint"
+  },
+  "peerDependencies": {
+    "eslint": ">=9.0.0"
+  },
+  "dependencies": {
+    "@next/eslint-plugin-next": "15.5.2",
+    "@tanstack/eslint-plugin-query": "5.83.1",
+    "@typescript-eslint/eslint-plugin": "*",
+    "@typescript-eslint/parser": "*",
+    "eslint-config-next": "15.5.2",
+    "eslint-config-prettier": "10.1.8",
+    "eslint-plugin-import": "2.32.0",
+    "eslint-plugin-jest": "29.0.1",
+    "eslint-plugin-jsx-a11y": "6.10.2",
+    "eslint-plugin-playwright": "2.2.2",
+    "eslint-plugin-prettier": "5.5.4",
+    "eslint-plugin-react": "7.37.5",
+    "eslint-plugin-testing-library": "7.6.6",
+    "eslint-plugin-vitest": "0.5.4",
+    "prettier": "3.6.2"
+  }
+}