fix: database.py 添加缺失的 kdocs_row_start/row_end 参数

修复保存金山文档配置时报 500 错误的问题

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

database.py

@@ -205,6 +205,8 @@ def update_system_config(
     kdocs_image_column=None,
     kdocs_admin_notify_enabled=None,
     kdocs_admin_notify_email=None,
+    kdocs_row_start=None,
+    kdocs_row_end=None,
 ):
     """更新系统配置（写入后立即失效缓存）。"""
     ok = _update_system_config(
@@ -231,6 +233,8 @@ def update_system_config(
         kdocs_image_column=kdocs_image_column,
         kdocs_admin_notify_enabled=kdocs_admin_notify_enabled,
         kdocs_admin_notify_email=kdocs_admin_notify_email,
+        kdocs_row_start=kdocs_row_start,
+        kdocs_row_end=kdocs_row_end,
     )
     if ok:
         invalidate_system_config_cache()