fix: Multiple bug fixes and code cleanup

- package.json: Add missing @eslint/js and globals devDependencies
- docker-entrypoint.sh: Fix X11 lock file name (.X1-lock → .X11-lock)
- epic-claimer-new.js: Use imported solveCloudflare/isCloudflareChallenge instead of duplicate implementations
- src/cloudflare.js: Fix solveCloudflare to use cfg.flaresolverr_url, remove unused imports
- epic-games.js: Remove unused code (getFreeGamesFromGraphQL, exchangeTokenForCookies, FREE_GAMES_QUERY, deviceAuthLoginSuccess variable)
- Run eslint --fix to clean up trailing spaces

package.json

@@ -33,6 +33,8 @@
     "tough-cookie": "^4.1.4"
   },
   "devDependencies": {
+    "@eslint/js": "^9.26.0",
+    "globals": "^15.14.0",
     "@stylistic/eslint-plugin-js": "^4.2.0",
     "eslint": "^9.26.0",
     "typescript": "^5.9.3"