fix(package): add "type": "module" to enable ES module support

[agaesh]

Title: fix(package): add "type": "module" to enable ES module support

Description

This pull request updates the package.json file to include the "type": "module" field.
This change enables native ES6 module support across the project, allowing the use of import and export syntax instead of CommonJS (require, module.exports).

Changes Made

• Added "type": "module" in package.json.

Rationale

• Ensures consistency with the ongoing ES6 migration.
• Enables modern JavaScript syntax throughout the backend.
• Prevents module resolution errors when using ES6 imports.

Testing Notes

• No functional changes introduced.
• Application startup verified with npm run dev and npm start.
• Testing for ES6 import/export compatibility will be done in the next testing phase.