feat: Phase 2-5 API test scripts + create_monitor_job fix

Phase 2: 10/10 passed ✅
Phase 3: 7/7 passed ✅
Phase 4: 9/11 passed (2 known bugs - i.name column)
Phase 5: 13/23 passed (10 failures - pre-existing bugs)

Fixes:
- create_monitor_job: ON CONFLICT (uuid) DO UPDATE to prevent duplicate key errors
- test scripts: Correct request bodies for all visual search endpoints

scripts/test_m5api_phase3.sh

@@ -62,7 +62,7 @@ test_api "POST" "/api/v1/file/$FILE_UUID/process" '{"processors":["cut"]}' "Trig
 echo ""
 echo "── Pipeline Status ──"
 test_api "GET" "/api/v1/stats/ingestion-status/$FILE_UUID" "" "Ingestion status"
-test_api "GET" "/api/v1/health/detailed" "" "Detailed health"
+test_api "GET" "/health/detailed" "" "Detailed health"
 
 echo ""
 echo "── Chunking ──"