Fix script crash: remove set -u, handle python exit safely

- set -euo → set -eo (unset var no longer fatal)
- Python snapshot lookup: catch exceptions, use || true
- Prevents script exit on empty PBS responses

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

pharmq-setup.sh

@@ -13,7 +13,7 @@
 # Phase 8: 검증 + 결과 출력
 #
 
-set -euo pipefail
+set -eo pipefail
 
 # ============================================================
 # 명령행 인자 처리
@@ -483,21 +483,24 @@ PYEOF
         -H "CSRFPreventionToken: ${PBS_CSRF}" > /tmp/pbs_snapshots.json
 
     local LATEST_SNAPSHOT
-    LATEST_SNAPSHOT=$(python3 << 'PYEOF'
+    LATEST_SNAPSHOT=$(python3 << 'PYEOF' || true
 import json, sys
 from datetime import datetime
-with open('/tmp/pbs_snapshots.json', 'r') as f:
+try:
+    with open('/tmp/pbs_snapshots.json', 'r') as f:
         data = json.load(f)
-snapshots = data.get("data", [])
-if not snapshots:
-    sys.exit(1)
-latest = max(snapshots, key=lambda x: x.get("backup-time", 0))
-backup_time = latest.get("backup-time", 0)
-print(datetime.utcfromtimestamp(backup_time).strftime("%Y-%m-%dT%H:%M:%SZ"))
+    snapshots = data.get("data", [])
+    if not snapshots:
+        sys.exit(0)
+    latest = max(snapshots, key=lambda x: x.get("backup-time", 0))
+    backup_time = latest.get("backup-time", 0)
+    print(datetime.utcfromtimestamp(backup_time).strftime("%Y-%m-%dT%H:%M:%SZ"))
+except Exception:
+    pass
 PYEOF
     )
 
-    if [ -z "$LATEST_SNAPSHOT" ]; then
+    if [ -z "${LATEST_SNAPSHOT:-}" ]; then
         print_err "백업을 찾을 수 없습니다."
         exit 1
     fi