Fix super-linter v8 ESLint configuration error

[Copilot]

Super-linter v8 upgraded to ESLint 9.39.1, which failed with Cannot find package '@eslint/json' when loading .github/linters/eslint.config.mjs.

Changes

• Removed @eslint/json plugin dependency from ESLint config
• Simplified config to validate JavaScript files only
• JSON validation continues via super-linter's native VALIDATE_JSON: true

Config Before

import json from "@eslint/json";

export default [
  {
    files: ["**/*.json"],
    plugins: { json },
    // ...
  },
  // ...
];

Config After

export default [
  {
    files: ["**/*.js"],
    languageOptions: {
      sourceType: "script",
      // ...
    }
  }
];

Testing Limitation

This branch doesn't trigger the lint workflow (runs only on main). Local ESLint validation passes, but CI validation requires workflow dispatch or merge to confirm.

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