⚡ Bolt: Concurrent API requests in Cloudflare Worker

[Snigdh41]

💡 What: Replaced sequential resend.emails.send API calls with a concurrent execution using Promise.all().
🎯 Why: Sequential external API calls accumulate latency, significantly increasing the total execution time of the Cloudflare Worker. Concurrent execution minimizes the wait time.
📊 Impact: Reduces the total latency of email sending by approximately 50%, resulting in a faster response to the client.
🔬 Measurement: Check the execution time of the /contact endpoint before and after the change; the total time spent waiting for the Resend API will be roughly equal to the slower of the two requests, rather than the sum of both.

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PR created automatically by Jules for task 9386434685312891706 started by @Snigdh41

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