feat: trace data indicators, inline tap config, and detail tab gating

Trace data visibility:
- ProcessorNode now includes hasTraceData flag computed from captured
  body/headers during tree conversion
- ConfigBadge shows teal for tracing configured, green when data captured
- Search results show green footprints icon for exchanges with trace data
- New has_trace_data column on executions table (V11 migration with backfill)
- OpenSearch documents and ExecutionSummary include the flag

Inline tap configuration:
- Extracted reusable TapConfigModal component from RouteDetail
- Diagram context menu opens tap modal inline instead of navigating away
- Toggle-trace action works immediately with toast feedback
- Modal closes only on ESC, Cancel, Save, or Delete (not backdrop click)

Detail panel tab gating:
- Headers, Input, Output tabs disabled when no data is available
- Works at both exchange and processor level
- Falls back to Info tab when active tab becomes empty

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/components/ProcessDiagram/DiagramNode.tsx

@@ -138,7 +138,9 @@ export function DiagramNode({
       </g>
 
       {/* Config badges */}
-      {config && <ConfigBadge nodeWidth={w} config={config} />}
+      {(config || executionState?.hasTraceData) && (
+        <ConfigBadge nodeWidth={w} config={config ?? {}} hasTraceData={executionState?.hasTraceData} />
+      )}
 
       {/* Execution overlay: status badge inside card, top-right corner */}
       {isCompleted && (