⚡ Bolt: [performance improvement] Concurrent email sending

[Snigdh41]

💡 What: Refactored the contact-api worker to send the notification and auto-reply emails concurrently using Promise.all(), rather than waiting for one to finish before starting the other.

🎯 Why: The worker was previously making two sequential external HTTP requests to the Resend API. External requests are the primary source of latency in a Cloudflare Worker. By making these requests sequential, we were artificially doubling the wait time and unnecessarily keeping the worker alive longer than needed.

📊 Impact: Reduces the total execution time of the email-sending portion of the worker by roughly 50% (dependent on Resend API latency).

🔬 Measurement: In the Cloudflare dashboard, the execution duration metrics for the /contact route will show a marked decrease. You can also visually see that the "Auto-reply result" and "Notification result" logs arrive simultaneously rather than staggered.

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PR created automatically by Jules for task 4417399727005526533 started by @Snigdh41

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