Add URL Input Support for Fact-Checking

[Akash6299625764]

This PR adds the ability for the FactChecker API to accept a URL in addition to plain text.

Changes included:

Added utils/fetch_url.py to fetch and extract text content from web pages.

Updated /predict and /predict_all endpoints to handle an optional "url" key.

If a URL is provided, the text is fetched and passed to the fact-checker; otherwise, text input is used.

Preserves existing prediction logic and backward compatibility.

How to test:

Run the Flask app locally:

python app.py

Send a POST request with JSON body:

Text input: {"text": "Some news text"}

URL input: {"url": "https://example.com/article"}

Verify JSON response contains prediction, confidence, message, and analysis.

Benefit:

Allows users to quickly check the authenticity of online articles via URL.

Enhances usability and lays the groundwork for future front-end improvements.

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[Deepika14145]

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