Fix: wire Firecrawl API key and add retry handling for timeouts

[isaacnaor]

This PR addresses issues with Firecrawl integration in the AI Readiness API route.

Changes:

• Explicitly pass FIRECRAWL_API_KEY into the Firecrawl client to fix "API key required" errors.
• Add a minimal retry wrapper around firecrawl.scrape to handle upstream timeouts gracefully.
• Pin runtime to nodejs to avoid env variable quirks under the Edge runtime.
• Remove duplicate Firecrawl client instantiation and debug logs.

Why it helps:

• Ensures the app reliably detects and uses the Firecrawl API key.
• Makes timeouts less disruptive by retrying once before failing.
• Improves stability and clarity for contributors running the app locally.