feat: add Stellar SLA monitoring, asset synchronization, and route experimentation

[eyooTech]

Summary

This PR introduces route observability, asset synchronization, and route experimentation capabilities for Stellar integrations.

Changes

Route SLA Dashboard (#492)

• Added Stellar Route SLA dashboard
• Added SLA metrics visualization
• Added uptime statistics monitoring
• Added SLA breach highlighting and route health reporting

Asset Registry Synchronizer (#493)

• Added Stellar asset registry synchronization framework
• Added provider asset list synchronization
• Added duplicate asset resolution
• Added local registry update workflow

Route Experimentation Framework (#497)

• Added configurable route experimentation framework
• Added A/B testing support for route ranking strategies
• Added experiment outcome tracking
• Added configurable experiment variants and rollout settings

Acceptance Criteria

492 Stellar Route SLA Dashboard

• SLA dashboard implemented
• Route SLA metrics displayed
• Uptime statistics shown
• SLA breaches highlighted

493 Soroban Asset Registry Synchronizer

• Asset synchronization implemented
• Registry remains up-to-date

497 Soroban Route Experimentation Framework

• Experimentation framework implemented
• Experiments configurable

Closes #492
Closes #493
Closes #497

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