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/pages/Dashboard/Dashboard.tsx

@@ -1,6 +1,6 @@
 import { useState, useMemo, useCallback } from 'react'
 import { useParams, useNavigate, useSearchParams } from 'react-router'
-import { AlertTriangle, X, Search } from 'lucide-react'
+import { AlertTriangle, X, Search, Footprints } from 'lucide-react'
 import {
   DataTable,
   StatusDot,
@@ -78,6 +78,7 @@ function buildBaseColumns(): Column<Row>[] {
         <span className={styles.statusCell}>
           <StatusDot variant={statusToVariant(row.status)} />
           <MonoText size="xs">{statusLabel(row.status)}</MonoText>
+          {row.hasTraceData && <Footprints size={11} color="#3D7C47" style={{ marginLeft: 2, flexShrink: 0 }} />}
         </span>
       ),
     },