Feature/backend horizon polling

[billcode124]

Description

Optimizes Stellar Horizon API polling by implementing exponential backoff with jitter to reduce excessive requests, handle failures gracefully, and prevent synchronized retries.

Changes

• Implement exponential backoff for Horizon polling tasks.
• Apply jitter to prevent synchronized retries.
• Slow down polling after failures or empty responses.
• Improve handling of Horizon rate limit errors.

Acceptance Criteria

• Polling slows down gracefully on failures or empty responses.
• Jitter is applied to prevent synchronized retries.
• Horizon rate limit errors are reduced by 90%.

Related Issue

Closes #675

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[Abdulazeem-code]

fix failed checks

[Abdulazeem-code]

Please fix failed checks