Add soft bounce logging

[hemamalinibala02-collab]

Changes Made

• Added bounce logging in webhook handling
• Logs bounce type and reason
• Marks lead as BOUNCED after logging

Purpose
Helps debug and monitor bounce events better.

[Kuldeeep18]

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[hemamalinibala02-collab]

Understood 👍 I’ll follow all the PR guidelines, ensure the code is clean, tested, and fix any CodeRabbit suggestions before submitting.