Add Cloudinary environment variables for image uploads

[AnujChhikara]

Description

We need to add Cloudinary configuration to enable profile picture uploads. Please add the following environment variables:

CLOUDINARY_CLOUD_NAME=your_cloud_name
CLOUDINARY_API_KEY=your_api_key
CLOUDINARY_API_SECRET=your_api_secret

Credentials:

We already have these values available in our existing backend, so you can reuse them directly.

If needed, you can retrieve them from Cloudinary:

1. Log in to your Cloudinary account
2. Navigate to the Dashboard (https://console.cloudinary.com/app/product-explorer)
3. Go to Settings (gear icon) → API Keys
4. From there we can get cloud name, api_key and api_secret