fix: update Gemini API endpoint to v1beta

[Udayan6611]

Description

This PR fixes the broken resume generation for the Gemini API by updating the endpoint from v1 to the required v1beta.

The previous v1 endpoint for gemini-1.5-flash was returning errors and failing the "AI Parse" stage for users. Updating the fetch URL restores full functionality for anyone selecting Gemini as their generation provider.

Changes Made

• Endpoint Update: Modified the fetch request URL in index.html to target https://generativelanguage.googleapis.com/v1beta/... instead of the outdated v1 path.

Testing & Validation

• Confirmed the bug locally: the v1 endpoint was throwing an HTTP error and halting the pipeline.
• Verified the fix: submitting a URL with a valid Gemini API key now successfully fetches the data, passes the parsing stage, and generates the final PDF resume without console errors.

Context: GirlScript Summer of Code (GSSoC '26) Contribution.

Fixes #12

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