⚡ Bolt: Run email sending concurrently

[Snigdh41]

💡 What: Updated the contact-api worker to send the notification email and the auto-reply email concurrently using Promise.all.
🎯 Why: The previous implementation awaited the external API requests sequentially. Since the requests are independent, running them concurrently avoids accumulating their individual latencies, reducing the total time the worker spends waiting for external services.
📊 Impact: Expected to reduce the total execution time of the email sending phase by roughly half (assuming both requests take similar time), resulting in a faster response to the client.
🔬 Measurement: Compare the latency of the /contact API endpoint before and after the change; observing worker execution times in Cloudflare dashboard logs should show a reduction in total duration.

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PR created automatically by Jules for task 8709793144682144678 started by @Snigdh41

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