[backend] fix: 修复异常处理和类型转换问题

frontend/node_modules/@vitest/snapshot/dist/environment.d.ts

@@ -0,0 +1,16 @@
+import { S as SnapshotEnvironment, a as SnapshotEnvironmentOptions } from './environment-cMiGIVXz.js';
+
+declare class NodeSnapshotEnvironment implements SnapshotEnvironment {
+    private options;
+    constructor(options?: SnapshotEnvironmentOptions);
+    getVersion(): string;
+    getHeader(): string;
+    resolveRawPath(testPath: string, rawPath: string): Promise<string>;
+    resolvePath(filepath: string): Promise<string>;
+    prepareDirectory(dirPath: string): Promise<void>;
+    saveSnapshotFile(filepath: string, snapshot: string): Promise<void>;
+    readSnapshotFile(filepath: string): Promise<string | null>;
+    removeSnapshotFile(filepath: string): Promise<void>;
+}
+
+export { NodeSnapshotEnvironment, SnapshotEnvironment };