feat: pgvector similar-incident retrieval + SimilarIncidentsPanel

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FFDuBhMKvoWjrWT3ZnGmmr

app/api/incidents/route.ts

@@ -109,5 +109,14 @@ export async function POST(request: Request) {
   sendNewIncidentEmail(incident.id, zone.site_id, incident.reference_no ?? '', input.incident_type)
     .catch(err => console.error('email notification failed:', err))
 
+  // Embed description asynchronously for future similarity search
+  import('@/lib/claude/embed').then(({ embedText }) =>
+    embedText(input.description.trim()).then(embedding =>
+      supabase.from('incidents').update({
+        embedding: `[${embedding.join(',')}]` as unknown as string,
+      }).eq('id', incident.id)
+    )
+  ).catch(err => console.error('embed error:', err))
+
   return NextResponse.json({ id: incident.id, reference_no: incident.reference_no }, { status: 201 })
 }