fix: add projectId field to API key schema and update sign-up link #8
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This PR addresses two issues:
Fixes the sign-up link: The sign-up link on the sign-in page was broken and is now fixed.

src/lib/auth.tsResolves API key authentication failures: A missing field in the API key validation schema was causing
valid keys to be rejected. This has been corrected.
src/routes/(auth)/sign-in/+page.svelte