fix: use x-goog-api-key header instead of URL query parameter for Gemini (#70)

[saurabhhhcodes]

The Gemini API key was appended to the request URL as a query
parameter (key=...), exposing it in network logs, browser
history, and error messages. Changed to use the x-goog-api-key
HTTP header which is the recommended approach.

Fixes Ruthwik000#70

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 0a55b9a and 0070736.

📒 Files selected for processing (3)

• src/core/pricingRegistry.ts
• src/introspection/modelLister.ts
• src/router/providerHeaders.ts

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• Commit unit tests in branch fix-70-gemini-api-key-header

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[saurabhhhcodes]

🔔 Friendly ping @saurabhhhcodes — this real fix has passing CI and references an approved GSSoC issue. Ready for review/merge. Thanks!

[saurabhhhcodes]

🔔 Friendly ping @saurabhhhcodes — this real fix has passing CI and references an approved GSSoC issue. Ready for review/merge. Thanks!