Add Actix-web UI adapter for observability endpoints

[alob-mtc]

Summary

Add support for Actix-web as an alternative HTTP framework for the observability UI endpoints.

Context

The observability UI module has been refactored to be framework-agnostic (see src/observability/ui/). Currently, only Axum is supported via the axum-ui feature flag. This issue tracks adding Actix-web support.

Requirements

• Create src/observability/ui/actix.rs with Actix-web handlers
• Add actix-ui feature flag in Cargo.toml
• Update src/observability/ui/mod.rs to conditionally export Actix routes
• Implement the following endpoints:
  • GET / - Serve console HTML
  • GET /stats - Queue statistics
  • GET /activities/:key - List activities by status or get by ID
  • GET /activities/:id/events - Activity event history
  • GET /activities/:id/result - Activity result
  • GET /dead-letter - Dead letter queue listing
  • GET /stream - SSE event stream
• Add example demonstrating Actix-web usage
• Update documentation

Technical Notes

• Use actix-web crate
• SSE can be implemented using actix-web-lab or similar
• Follow the same pattern as src/observability/ui/axum.rs
• All data operations should go through QueueInspector

Feature Flag

[features]
actix-ui = ["dep:actix-web", "dep:actix-web-lab"]

Related

• Axum implementation: src/observability/ui/axum.rs
• Static HTML: src/observability/ui/html.rs

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🔗 Similar Issues

Related Issues

• Enhance Metrics Collection System #31

🔗 Related PRs

#22 - Added QueueInspector and UI-dashboard plugin [merged]

👤 Suggested Assignees

• alob-mtc

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