Remove package.json from ESLint target

[oppai]

📝 Description

This PR removes package.json from the list of files linted by ESLint.

Since package.json is a JSON configuration file—not JavaScript code—linting it with ESLint is non-standard and does not provide meaningful value. Dedicated tools such as npm-package-json-lint or sort-package-json are more appropriate for formatting and validating package.json.

Changes:

• Removed package.json from the lint and lintfix npm scripts
• Updated prepublishOnly script to exclude package.json

Motivation:

ESLint is designed for analyzing JavaScript/TypeScript source files. Including package.json could lead to confusion or unnecessary errors. This cleanup improves the clarity and accuracy of the linting process.

[CLAassistant]

All committers have signed the CLA.