Summary: Scrapingdog adds one-time credit top-ups

Why It Matters: Users can now buy extra credits without changing their monthly plan. This helps people who only need more data for a short time.

What Changed:

• Added a new option to buy one-time credits through the user dashboard.
• Clarified that one-time credits expire at the end of the current billing cycle.
• Added a prompt for users to upgrade to higher recurring plans for permanent credit increases.