Upgrade linting stack to ESLint v10 compatibility

[Copilot]

This updates the repo’s ESLint stack to v10 and resolves compatibility issues in the flat config setup. The change keeps linting behavior focused on currently supported plugins while unblocking the major-version upgrade.

• Dependency updates

  • Bumped eslint to ^10.2.1
  • Bumped @eslint/js to ^10.0.1
  • Removed eslint-plugin-import from dev dependencies due to its current peer range excluding ESLint 10

• Flat config cleanup

  • Removed eslint-plugin-import import and its flat config entries from eslint.config.mjs
  • Kept existing TypeScript + Jest lint config intact

• Resulting config shape

  export default tseslint.config(
    eslint.configs.recommended,
    tseslint.configs.recommended,
    {
      plugins: { jest },
      rules: {
        '@typescript-eslint/no-unsafe-function-type': 'off',
        '@typescript-eslint/no-explicit-any': 'warn',
      },
    },
  );