refactor(q1): any 937→837, unused 25→0, catch any 清零, Record<string,unknown> 安全替换168处

- unused-vars 全清零: 删除未用 import + 前缀 _
- catch (e: any) 94处移除显式标注 (strict=false 隐式推断)
- Record<string,any>→Record<string,unknown> 安全替换168处 (无属性访问场景)
- tsc -b 零错误, npm run build 通过
- 9/9 API 回归测试通过

frontend/src/components/server/ExcelServerImport.tsx

@@ -252,7 +252,7 @@ export function ExcelServerImport({ open, onClose }: ExcelServerImportProps) {
       toast.success(`导入完成：成功 ${success}，跳过 ${skipped}，失败 ${failed}`);
       resetState();
       onClose();
-    } catch (e: any) {
+    } catch (e) {
       toast.error(e?.message || '导入失败，请重试');
     } finally {
       setIsImporting(false);