feat: add workflow brand tree reset action

app/(admin)/settings/agent-workflow/agent-workflow-settings-client.tsx

@@ -1161,6 +1161,28 @@ export function AgentWorkflowSettingsClient({
     });
   };
 
+  const handleClearBrandTree = () => {
+    if (brandStoreEntries.length === 0) {
+      toast.error("当前没有可清空的层级树数据");
+      return;
+    }
+
+    const confirmed = window.confirm(
+      `确认清空当前所有${firstCategoryLabel}/${secondCategoryLabel}及分类层级数据吗？此操作不会影响价格带和其它系统设置。`
+    );
+    if (!confirmed) {
+      return;
+    }
+
+    updateInputOptions([]);
+    setBrandDraft("");
+    setStoreDrafts({});
+    setThirdCategoryDrafts({});
+    setFourthCategoryDrafts({});
+    setFifthCategoryDrafts({});
+    toast.success("层级树数据已清空，可重新导入表格");
+  };
+
   const handleAddThirdCategoryToStore = (brandName: string, storeName: string) => {
     const draftKey = createStoreDraftKey(brandName, storeName);
     const nextValue = normalizeInputOptionValue(thirdCategoryDrafts[draftKey] || "");
@@ -3572,6 +3594,16 @@ export function AgentWorkflowSettingsClient({
                             )}
                             导入表格
                           </Button>
+                          <Button
+                            type="button"
+                            variant="outline"
+                            onClick={handleClearBrandTree}
+                            className="h-8 border-destructive/25 text-destructive hover:border-destructive/40 hover:bg-destructive/10 hover:text-destructive"
+                            disabled={brandStoreEntries.length === 0}
+                          >
+                            <Trash2 className="mr-2 h-4 w-4" />
+                            清空当前数据
+                          </Button>
                         </div>
                       </div>
                       <input