feat(backend): add exponential backoff retry to webhook delivery in webhookService

[ogazboiz]

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Area: Backend (Webhook Service)

sendToWebhook() fires once and records success or failure. There is no retry for transient failures (network timeout, 5xx from consumer). Any temporary downtime at the consumer endpoint causes permanent event loss.

Fix: Implement exponential backoff retry — 3 attempts over ~1 hour before marking delivery as failed. Persist retry state in DB.

[Godsmiracle001]

@Godsmiracle001 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

can i handle this

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This issue has been completed by @Godsmiracle001 as part of the Stellar Wave Program's 3rd Wave 🥳

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