CAMEL-23544: Fix null fromRouteId and endpoint tracking for delegating consumers (platform-http)

[davsclaus]

Summary

• DefaultPlatformHttpConsumer: override setRouteId() to propagate the route ID to the nested VertxPlatformHttpConsumer. Previously, the nested consumer was created in doInit() before RouteService.doSetup() called setRouteId() on the outer consumer, so exchanges carried a null fromRouteId and endpoint TOTAL counts showed 0.

• DefaultRuntimeEndpointRegistry: track the consumer's endpoint URI in the inputs map when it differs from the route's logical endpoint URI (e.g. rest-openapi://... → platform-http:///path). RouteAddedEvent now adds both URIs; RouteRemovedEvent removes both from inputUtilization. The ExchangeCreatedEvent handler keeps a defensive null-routeId fallback scan for other delegating components.

• SyntheticBacklogTracer SPI (new): extends BacklogTracer with traceFirstNode / traceLastNode for components that process exchanges inline and bypass the route pipeline (e.g. rest-openapi mock mode). BacklogTracer impl now implements this interface. DefaultRestOpenapiProcessorStrategy uses it to emit synthetic first/last trace events so mock responses participate in message-history capture.

Test plan

• DefaultRuntimeEndpointRegistry existing tests pass
• BacklogTracer existing tests pass
• rest-openapi consumer with mock mode: verify trace events appear in history
• rest-openapi route with platform-http: verify TOTAL hit count increments correctly in endpoint statistics

Claude Code on behalf of Claus Ibsen

[github-actions]

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[davsclaus]

Closing — all changes from this PR have been incorporated into the feat/camel-tui branch.