feat: map engineLevel and route-level snapshots in IngestionService

Extract inputBody/outputBody/inputHeaders/outputHeaders from RouteExecution
snapshots and pass to ExecutionRecord. Maps engineLevel field. Critical for
REGULAR mode where no processor records exist but route-level payloads do.

cameleer3-server-core/src/main/java/com/cameleer3/server/core/ingestion/IngestionService.java

@@ -1,5 +1,6 @@
 package com.cameleer3.server.core.ingestion;
 
+import com.cameleer3.common.model.ExchangeSnapshot;
 import com.cameleer3.common.model.ProcessorExecution;
 import com.cameleer3.common.model.RouteExecution;
 import com.cameleer3.server.core.indexing.ExecutionUpdatedEvent;
@@ -77,6 +78,25 @@ public class IngestionService {
         String diagramHash = diagramStore
                 .findContentHashForRoute(exec.getRouteId(), agentId)
                 .orElse("");
+
+        // Extract route-level snapshots (critical for REGULAR mode where no processors are recorded)
+        String inputBody = null;
+        String outputBody = null;
+        String inputHeaders = null;
+        String outputHeaders = null;
+
+        ExchangeSnapshot inputSnapshot = exec.getInputSnapshot();
+        if (inputSnapshot != null) {
+            inputBody = truncateBody(inputSnapshot.getBody());
+            inputHeaders = toJson(inputSnapshot.getHeaders());
+        }
+
+        ExchangeSnapshot outputSnapshot = exec.getOutputSnapshot();
+        if (outputSnapshot != null) {
+            outputBody = truncateBody(outputSnapshot.getBody());
+            outputHeaders = toJson(outputSnapshot.getHeaders());
+        }
+
         return new ExecutionRecord(
                 exec.getExchangeId(), exec.getRouteId(), agentId, applicationName,
                 exec.getStatus() != null ? exec.getStatus().name() : "RUNNING",
@@ -84,7 +104,9 @@ public class IngestionService {
                 exec.getStartTime(), exec.getEndTime(),
                 exec.getDurationMs(),
                 exec.getErrorMessage(), exec.getErrorStackTrace(),
-                diagramHash
+                diagramHash,
+                exec.getEngineLevel(),
+                inputBody, outputBody, inputHeaders, outputHeaders
         );
     }