fix: populate diagramContentHash in chunked ingestion pipeline

ChunkAccumulator now injects DiagramStore and looks up the content hash
when converting to MergedExecution. Without this, the detail page had
no diagram hash, so the overlay couldn't find the route diagram.

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

cameleer3-server-app/src/main/java/com/cameleer3/server/app/config/StorageBeanConfig.java

@@ -107,10 +107,12 @@ public class StorageBeanConfig {
     @ConditionalOnProperty(name = "cameleer.storage.executions", havingValue = "clickhouse", matchIfMissing = true)
     public ChunkAccumulator chunkAccumulator(
             WriteBuffer<MergedExecution> executionBuffer,
-            WriteBuffer<ChunkAccumulator.ProcessorBatch> processorBatchBuffer) {
+            WriteBuffer<ChunkAccumulator.ProcessorBatch> processorBatchBuffer,
+            DiagramStore diagramStore) {
         return new ChunkAccumulator(
                 executionBuffer::offer,
                 processorBatchBuffer::offer,
+                diagramStore,
                 java.time.Duration.ofMinutes(5));
     }