⚡ Bolt: Concurrent API requests for email sending

[Snigdh41]

💡 What: Executed the notification and auto-reply email sending requests concurrently using Promise.all().
🎯 Why: Previously, these requests were awaited sequentially, which accumulates latency and increases the overall response time of the worker.
📊 Impact: Reduces the email sending phase execution time by approximately 50%, improving the API's overall response speed.
🔬 Measurement: Verified by observing the network timing of the /contact POST request; the concurrent batching prevents consecutive round-trip delays.

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PR created automatically by Jules for task 9772541965053854335 started by @Snigdh41

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