fix: 修复配额说明重复和undefined问题

- 在editStorageForm中初始化oss_storage_quota_value和oss_quota_unit
- 删除重复的旧配额说明块，保留新的当前配额设置显示

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

backend/node_modules/ecdsa-sig-formatter/src/ecdsa-sig-formatter.d.ts

@@ -0,0 +1,17 @@
+/// <reference types="node" />
+
+declare module "ecdsa-sig-formatter" {
+	/**
+	 * Convert the ASN.1/DER encoded signature to a JOSE-style concatenated signature. Returns a base64 url encoded String.
+	 *    If signature is a String, it should be base64 encoded
+	 *    alg must be one of ES256, ES384 or ES512
+	 */
+	export function derToJose(signature: Buffer | string, alg: string): string;
+
+	/**
+	 * Convert the JOSE-style concatenated signature to an ASN.1/DER encoded signature. Returns a Buffer
+	 *     If signature is a String, it should be base64 url encoded
+	 *     alg must be one of ES256, ES384 or ES512
+	 */
+	export function joseToDer(signature: Buffer | string, alg: string): Buffer
+}