feat(alert-routing): implement issue #270 alert routing engine with a…

[Yusufolosun]

Closes #270

Summary

Introduces a complete alert routing engine with rule-based matching, preference-aware channel routing, suppression windows, fallback dispatch, and routing audit history.

Backend

• Added new tables for routing rules and routing audit
• Added AlertRoutingService for routing decisions and dispatch orchestration
• Integrated routing into the alert evaluation flow
• Added admin-protected APIs for rule CRUD and audit queries
• Removed legacy direct webhook dispatch from alert evaluation so routing suppression/fallback policies are consistently enforced

Frontend

• Added admin alert routing page to create/toggle/delete rules and inspect audit entries
• Wired API client/types, route, and navigation entry

Documentation

• Added alert routing engine behavior and API/UI docs

Testing

• ✅ Unit tests added covering rule matching, channel resolution, and severity threshold behavior

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[Mosas2000]

Resolve the conflict

[Yusufolosun]

@Mosas2000 Conflicts resolved