fix: allow direct knowledge deletion

ai_knowledge_base_v2/apps/backend/app/api/admin_knowledge.py

@@ -192,12 +192,13 @@ def delete_knowledge(
 ) -> dict:
     _require_super_admin(current_admin)
     knowledge = _get_knowledge(db, knowledge_id)
-    if knowledge.lifecycle_status != "archived" or knowledge.status != 0:
-        raise HTTPException(
-            status_code=status.HTTP_409_CONFLICT,
-            detail="物理删除前必须先关闭并归档知识库",
-        )
-    # 清理早期按用户授权口径留下的历史关联，避免外键阻止知识库删除。
+    # 删除操作本身会立即停止开放并清理正式内容，不再要求管理员先执行“关闭、归档”两步。
+    knowledge.status = 0
+    knowledge.lifecycle_status = "archived"
+    db.add(knowledge)
+    db.flush()
+
+    # 清理按用户授权口径留下的历史关联，避免外键阻止知识库删除。
     permissions = db.scalars(
         select(UserKnowledgePermission).where(UserKnowledgePermission.knowledge_id == knowledge.id)
     ).all()
@@ -212,9 +213,16 @@ def delete_knowledge(
     db.flush()
     for row in db.scalars(select(KnowledgeSourceSnapshot).where(KnowledgeSourceSnapshot.knowledge_id == knowledge.id)).all():
         db.delete(row)
-    db.delete(knowledge)
     OperationLogService.write(db, admin_id=current_admin.id, module="knowledge", action="delete", target_id=knowledge.id)
-    db.commit()
+    db.delete(knowledge)
+    try:
+        db.commit()
+    except IntegrityError as exc:
+        db.rollback()
+        raise HTTPException(
+            status_code=status.HTTP_409_CONFLICT,
+            detail="知识库仍有关联数据，删除未执行，请刷新后重试",
+        ) from exc
     return api_success()