update eslint and refactor backend

package.json

@@ -6,7 +6,8 @@
   "scripts": {
     "dev": "bun --hot src/index.ts",
     "build": "bun build ./src/index.html --outdir=dist --sourcemap --target=browser --minify --define:process.env.NODE_ENV='\"production\"' --env='BUN_PUBLIC_*'",
-    "start": "NODE_ENV=production bun src/index.ts"
+    "start": "NODE_ENV=production bun src/index.ts",
+    "eslint-quiet": "eslint 'src/**/*.{ts,tsx}' --quiet"
   },
   "dependencies": {
     "@emotion/react": "11.14.0",
@@ -14,23 +15,18 @@
     "@fontsource/roboto": "5.2.8",
     "@mui/icons-material": "7.3.5",
     "@mui/material": "7.3.5",
+    "cookie": "^1.0.2",
+    "mobx-react-lite": "^4.1.1",
     "react": "19",
     "react-dom": "19",
     "react-router-dom": "^7.9.5"
   },
   "devDependencies": {
-    "@eslint/js": "9.39.1",
-    "@stylistic/eslint-plugin": "5.5.0",
     "@types/bun": "1.3.1",
     "@types/react": "19",
     "@types/react-dom": "19",
-    "eslint": "9.39.1",
-    "eslint-plugin-jsx-a11y": "6.10.2",
-    "eslint-plugin-react": "7.37.5",
-    "eslint-plugin-react-hooks": "7.0.1",
-    "eslint-plugin-unused-imports": "^4.3.0",
     "prettier": "3.6.2",
     "typescript": "5.9.3",
-    "typescript-eslint": "8.46.3"
+    "@sebastianbrenner/eslint-config": "git+https://gitea.sebastianbrenner.dev/sebastianbrenner/eslint-config.git/#1.2.0"
   }
 }