Add load testing job to GitHub Actions CI pipeline (FRE-4931)

- Add load-test job to ci.yml that runs after docker-build on push to main
- Create combined load test runner (scripts/load-test/run-all.sh) for all services
- Create k6 load test scripts for api, darkwatch, spamshield, and voiceprint
- Add shared k6 utilities (lib/common.js)
- Update load-test.yml to support all services and report artifacts
- Configure k6 cloud output and P99 threshold validation
- Generate load test report as CI artifact

Co-Authored-By: Paperclip <noreply@paperclip.ing>

scripts/load-test/run-all.sh

@@ -0,0 +1,103 @@
+#!/usr/bin/env bash
+# Combined load test runner for all ShieldAI services
+# Usage: ./run-all.sh [service]
+#   service: all (default), api, darkwatch, spamshield, voiceprint
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPORT_DIR="${SCRIPT_DIR}/reports"
+TIMESTAMP="$(date +%Y%m%d-%H%M%S)"
+SUMMARY_FILE="${REPORT_DIR}/summary-${TIMESTAMP}.json"
+THRESHOLD_FILE="${REPORT_DIR}/threshold-results.json"
+SERVICE="${1:-all}"
+
+mkdir -p "$REPORT_DIR"
+
+BASE_URL="${LOAD_TEST_BASE_URL:-http://localhost:3000}"
+TARGET_RPS="${TARGET_RPS:-500}"
+DURATION="${DURATION:-300s}"
+
+echo "=== ShieldAI Combined Load Test ==="
+echo "Timestamp: $TIMESTAMP"
+echo "Base URL: $BASE_URL"
+echo "Target RPS: $TARGET_RPS"
+echo "Duration: $DURATION"
+echo "Service: $SERVICE"
+echo ""
+
+K6_OPTS="--duration $DURATION --summary-export $SUMMARY_FILE"
+
+if [[ -n "${K6_CLOUD_TOKEN:-}" ]]; then
+  K6_OPTS="$K6_OPTS --out cloud"
+  echo "k6 cloud output: enabled"
+fi
+
+declare -A EXIT_CODES
+ALL_PASSED=true
+
+run_service_test() {
+  local name=$1
+  local script=$2
+  local env_vars=$3
+
+  echo ""
+  echo "=== Running $name Load Test ==="
+
+  set +e
+  eval "$env_vars" k6 run $K6_OPTS "$script"
+  EXIT_CODE=$?
+  set -e
+
+  EXIT_CODES[$name]=$EXIT_CODE
+  if [[ $EXIT_CODE -ne 0 ]]; then
+    ALL_PASSED=false
+    echo "❌ $name load test FAILED (exit code: $EXIT_CODE)"
+  else
+    echo "✅ $name load test PASSED"
+  fi
+}
+
+if [[ "$SERVICE" == "all" || "$SERVICE" == "api" ]]; then
+  run_service_test "api" "${SCRIPT_DIR}/services/api.js" "BASE_URL=$BASE_URL TARGET_RPS=$TARGET_RPS"
+fi
+
+if [[ "$SERVICE" == "all" || "$SERVICE" == "darkwatch" ]]; then
+  run_service_test "darkwatch" "${SCRIPT_DIR}/services/darkwatch.js" "BASE_URL=$BASE_URL TARGET_RPS=$TARGET_RPS"
+fi
+
+if [[ "$SERVICE" == "all" || "$SERVICE" == "spamshield" ]]; then
+  run_service_test "spamshield" "${SCRIPT_DIR}/services/spamshield.js" "BASE_URL=$BASE_URL TARGET_RPS=$TARGET_RPS"
+fi
+
+if [[ "$SERVICE" == "all" || "$SERVICE" == "voiceprint" ]]; then
+  run_service_test "voiceprint" "${SCRIPT_DIR}/services/voiceprint.js" "BASE_URL=$BASE_URL TARGET_RPS=$TARGET_RPS"
+fi
+
+echo ""
+echo "=== Load Test Results ==="
+echo "Summary saved to: $SUMMARY_FILE"
+
+# Aggregate thresholds
+jq -n \
+  --arg timestamp "$TIMESTAMP" \
+  --arg base_url "$BASE_URL" \
+  --arg target_rps "$TARGET_RPS" \
+  --argjson exit_codes "$(printf '%s\n' "${!EXIT_CODES[@]}" | jq -R . | jq -s 'with_entries(.key = .[0])' | while read key; do echo; done)" \
+  '{timestamp: $timestamp, base_url: $base_url, target_rps: $target_rps, services: $exit_codes}' \
+  > "$THRESHOLD_FILE" 2>/dev/null || true
+
+for service in "${!EXIT_CODES[@]}"; do
+  status="pass"
+  [[ ${EXIT_CODES[$service]} -ne 0 ]] && status="fail"
+  echo "$service: $status"
+done
+
+echo ""
+if $ALL_PASSED; then
+  echo "✅ All load tests passed"
+  exit 0
+else
+  echo "❌ Some load tests failed"
+  exit 1
+fi