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/svg-captcha/lib/option-manager.js

@@ -0,0 +1,32 @@
+'use strict';
+const path = require('path');
+const opentype = require('opentype.js');
+const charPreset = require('./char-preset');
+
+const fontPath = path.join(__dirname, '../fonts/Comismsh.ttf');
+const font = opentype.loadSync(fontPath);
+const ascender = font.ascender;
+const descender = font.descender;
+
+const options = {
+	width: 150,
+	height: 50,
+	noise: 1,
+	color: false,
+	background: '',
+	size: 4,
+	ignoreChars: '',
+	fontSize: 56,
+	charPreset, font, ascender, descender
+};
+
+const loadFont = filepath => {
+	const font = opentype.loadSync(filepath);
+	options.font = font;
+	options.ascender = font.ascender;
+	options.descender = font.descender;
+};
+
+module.exports = {
+	options, loadFont
+};