feat: consolidate enhancements and fixes (#375, #376, #377, #378)

[ayomideadeniran]

Description

This PR consolidates multiple enhancements, architectural improvements, and reliability fixes across the Harvest-Finance platform.

Key Changes

• Pagination Enhancement: Added cursor-based pagination (skip/limit) to getPublicVaults to prevent timeouts as the number of vaults grows.
• Architecture Refactoring: Extracted repeated notification-building logic into a centralized NotificationHelper, resolving inconsistencies when notification templates change.
• Network Reliability: Implemented the CircuitBreaker pattern for Stellar Horizon calls, preventing cascading failures across the app during Stellar network outages.
• Code Quality Improvements: Refactored SorobanExceptionFilter to utilize a typed error code map rather than fragile substring matching, improving robustness against SDK error message updates.

Related Issues

Closes #375
Closes #376
Closes #377
Closes #378

Testing Instructions

• Verify getPublicVaults correctly paginates results using the new parameters.
• Ensure notifications are generated consistently via the new NotificationHelper.
• Simulate a Stellar Horizon outage to verify the circuit breaker correctly opens and degrades gracefully.
• Trigger Soroban SDK errors to confirm the updated SorobanExceptionFilter maps and handles them appropriately.

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