refactor: remove diagramNodeId indirection, use processorId directly

Agent now uses Camel processorId as RouteNode.id, eliminating the
nodeId mapping layer. Drop diagram_node_id column (V6 migration),
remove from ProcessorRecord/ProcessorNode/IngestionService/DetailService,
add /processor-routes endpoint for processorId→routeId lookup,
simplify frontend diagram-mapping and ExchangeDetail overlays,
replace N diagram fetches in AppConfigPage with single hook.

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

cameleer3-server-core/src/main/java/com/cameleer3/server/core/detail/DetailService.java

@@ -47,7 +47,7 @@ public class DetailService {
                     p.processorId(), p.processorType(), p.status(),
                     p.startTime(), p.endTime(),
                     p.durationMs() != null ? p.durationMs() : 0L,
-                    p.diagramNodeId(), p.errorMessage(), p.errorStacktrace(),
+                    p.errorMessage(), p.errorStacktrace(),
                     parseAttributes(p.attributes())
             ));
         }

cameleer3-server-core/src/main/java/com/cameleer3/server/core/detail/ProcessorNode.java

@@ -19,7 +19,6 @@ public final class ProcessorNode {
     private final Instant startTime;
     private final Instant endTime;
     private final long durationMs;
-    private final String diagramNodeId;
     private final String errorMessage;
     private final String errorStackTrace;
     private final Map<String, String> attributes;
@@ -27,7 +26,7 @@ public final class ProcessorNode {
 
     public ProcessorNode(String processorId, String processorType, String status,
                          Instant startTime, Instant endTime, long durationMs,
-                         String diagramNodeId, String errorMessage, String errorStackTrace,
+                         String errorMessage, String errorStackTrace,
                          Map<String, String> attributes) {
         this.processorId = processorId;
         this.processorType = processorType;
@@ -35,7 +34,6 @@ public final class ProcessorNode {
         this.startTime = startTime;
         this.endTime = endTime;
         this.durationMs = durationMs;
-        this.diagramNodeId = diagramNodeId;
         this.errorMessage = errorMessage;
         this.errorStackTrace = errorStackTrace;
         this.attributes = attributes;
@@ -52,7 +50,6 @@ public final class ProcessorNode {
     public Instant getStartTime() { return startTime; }
     public Instant getEndTime() { return endTime; }
     public long getDurationMs() { return durationMs; }
-    public String getDiagramNodeId() { return diagramNodeId; }
     public String getErrorMessage() { return errorMessage; }
     public String getErrorStackTrace() { return errorStackTrace; }
     public Map<String, String> getAttributes() { return attributes; }

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

@@ -119,7 +119,7 @@ public class IngestionService {
         for (ProcessorExecution p : processors) {
             flat.add(new ProcessorRecord(
                     executionId, p.getProcessorId(), p.getProcessorType(),
-                    p.getDiagramNodeId(), applicationName, routeId,
+                    applicationName, routeId,
                     depth, parentProcessorId,
                     p.getStatus() != null ? p.getStatus().name() : "RUNNING",
                     p.getStartTime() != null ? p.getStartTime() : execStartTime,

cameleer3-server-core/src/main/java/com/cameleer3/server/core/storage/ExecutionStore.java

@@ -2,6 +2,7 @@ package com.cameleer3.server.core.storage;
 
 import java.time.Instant;
 import java.util.List;
+import java.util.Map;
 import java.util.Optional;
 
 public interface ExecutionStore {
@@ -16,6 +17,8 @@ public interface ExecutionStore {
 
     List<ProcessorRecord> findProcessors(String executionId);
 
+    Map<String, String> findProcessorRouteMapping(String applicationName);
+
     record ExecutionRecord(
             String executionId, String routeId, String agentId, String applicationName,
             String status, String correlationId, String exchangeId,
@@ -28,7 +31,7 @@ public interface ExecutionStore {
 
     record ProcessorRecord(
             String executionId, String processorId, String processorType,
-            String diagramNodeId, String applicationName, String routeId,
+            String applicationName, String routeId,
             int depth, String parentProcessorId, String status,
             Instant startTime, Instant endTime, Long durationMs,
             String errorMessage, String errorStacktrace,