feat: include breadcrumb in embedding text

src/main/java/com/superbiz/agent/service/VectorIndexService.java

@@ -148,7 +148,7 @@ public class VectorIndexService {
             
             try {
                 // 生成向量
-                List<Float> vector = embeddingService.generateEmbedding(chunk.getContent());
+                List<Float> vector = embeddingService.generateEmbedding(buildEmbeddingText(chunk));
 
                 // 构建元数据（包含文件信息）
                 Map<String, Object> metadata = buildMetadata(path.toString(), chunk, chunks.size());
@@ -191,7 +191,7 @@ public class VectorIndexService {
 
             try {
                 // 生成向量
-                List<Float> vector = embeddingService.generateEmbedding(chunk.getContent());
+                List<Float> vector = embeddingService.generateEmbedding(buildEmbeddingText(chunk));
 
                 // 构建元数据（使用 docId 和 category）
                 Map<String, Object> metadata = buildDocumentMetadata(docId, chunk, chunks.size(), category);
@@ -280,6 +280,30 @@ public class VectorIndexService {
         return metadata;
     }
 
+    static String buildEmbeddingText(DocumentChunk chunk) {
+        String content = trimToEmpty(chunk.getContent());
+        String title = trimToEmpty(chunk.getTitle());
+        String breadcrumb = trimToEmpty(chunk.getBreadcrumb());
+
+        if (title.isEmpty() && breadcrumb.isEmpty()) {
+            return content;
+        }
+
+        StringBuilder text = new StringBuilder();
+        if (!title.isEmpty()) {
+            text.append("Title: ").append(title).append("\n");
+        }
+        if (!breadcrumb.isEmpty()) {
+            text.append("Path: ").append(breadcrumb).append("\n");
+        }
+        text.append("Content:\n").append(content);
+        return text.toString();
+    }
+
+    private static String trimToEmpty(String value) {
+        return value == null ? "" : value.trim();
+    }
+
     /**
      * 删除文件的旧数据（根据 metadata._source）
      */