ui: simplify DDS knowledge registration

dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/web/DdsVectorKnowledgeController.java

@@ -12,6 +12,8 @@ import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.servlet.mvc.support.RedirectAttributes;
 
+import java.util.UUID;
+
 @Controller
 public class DdsVectorKnowledgeController {
 
@@ -34,28 +36,38 @@ public class DdsVectorKnowledgeController {
 
   @PostMapping("/vector-knowledge/ingest")
   public String ingest(
-      @RequestParam String documentId,
+      @RequestParam(required = false, defaultValue = "") String documentId,
       @RequestParam String title,
       @RequestParam(required = false, defaultValue = "") String sourceUri,
       @RequestParam String content,
       @RequestParam String techTags,
       @RequestParam(defaultValue = "600") int chunkSize,
       @RequestParam(defaultValue = "DEMO") String embeddingMode,
+      @RequestParam(defaultValue = "false") boolean replaceExisting,
       RedirectAttributes redirectAttributes
   ) {
     try {
       var result = service.ingest(new VectorIngestCommand(
-          documentId, title, sourceUri, content, techTags, chunkSize, embeddingMode));
+          resolveDocumentId(documentId, replaceExisting), title, sourceUri, content, techTags, chunkSize, embeddingMode));
       redirectAttributes.addFlashAttribute("ingestResult", result);
       redirectAttributes.addFlashAttribute("message",
-          result.chunkCount() + "개 청크를 저장했습니다. DDS 권한 평가용 태그 "
-              + result.tagCount() + "개가 연결되었습니다.");
+          "지식자료를 등록하고 검색 준비를 완료했습니다.");
     } catch (Exception exception) {
       redirectAttributes.addFlashAttribute("errorMessage", exception.getMessage());
     }
     return "redirect:/vector-knowledge";
   }
 
+  private String resolveDocumentId(String documentId, boolean replaceExisting) {
+    if (documentId == null || documentId.isBlank()) {
+      return "knowledge-" + UUID.randomUUID();
+    }
+    if (!replaceExisting) {
+      throw new AppException("기존 자료를 교체하려면 교체 확인을 선택하세요.");
+    }
+    return documentId.trim();
+  }
+
   @PostMapping("/vector-knowledge/search")
   public String search(
       @RequestParam String userKey,