Phase 7: Search, filters, templates, and archive UI

Add full-text card search (PostgreSQL tsvector + GIN index) with navbar
SearchBar, client-side board filters (label/assignee/due date), board
templates (3 system templates + save-as-template API), and archive
toggle for both board listing and board view.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker-entrypoint.sh

@@ -27,5 +27,12 @@ else
   echo "WARNING: Failed to apply RLS policies. Continuing anyway..."
 fi
 
+echo "Applying full-text search indexes..."
+if psql "$DATABASE_URL" -f ./scripts/setup-search.sql; then
+  echo "Search indexes applied successfully."
+else
+  echo "WARNING: Failed to apply search indexes. Continuing anyway..."
+fi
+
 echo "Starting server..."
 exec node server.js