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/index.js

@@ -0,0 +1,91 @@
+'use strict';
+const chToPath = require('./ch-to-path');
+const random = require('./random');
+const optionMngr = require('./option-manager');
+
+const opts = optionMngr.options;
+
+const getLineNoise = function (width, height, options) {
+	const hasColor = options.color;
+	const noiseLines = [];
+	const min = options.inverse ? 7 : 1;
+	const max = options.inverse ? 15 : 9;
+	let i = -1;
+
+	while (++i < options.noise) {
+		const start = `${random.int(1, 21)} ${random.int(1, height - 1)}`;
+		const end = `${random.int(width - 21, width - 1)} ${random.int(1, height - 1)}`;
+		const mid1 = `${random.int((width / 2) - 21, (width / 2) + 21)} ${random.int(1, height - 1)}`;
+		const mid2 = `${random.int((width / 2) - 21, (width / 2) + 21)} ${random.int(1, height - 1)}`;
+		const color = hasColor ? random.color() : random.greyColor(min, max);
+		noiseLines.push(`<path d="M${start} C${mid1},${mid2},${end}" stroke="${color}" fill="none"/>`);
+	}
+
+	return noiseLines;
+};
+
+const getText = function (text, width, height, options) {
+	const len = text.length;
+	const spacing = (width - 2) / (len + 1);
+	const min = options.inverse ? 10 : 0;
+	const max = options.inverse ? 14 : 4;
+	let i = -1;
+	const out = [];
+
+	while (++i < len) {
+		const x = spacing * (i + 1);
+		const y = height / 2;
+		const charPath = chToPath(text[i], Object.assign({x, y}, options));
+
+		const color = options.color ?
+			random.color(options.background) : random.greyColor(min, max);
+		out.push(`<path fill="${color}" d="${charPath}"/>`);
+	}
+
+	return out;
+};
+
+const createCaptcha = function (text, options) {
+	text = text || random.captchaText();
+	options = Object.assign({}, opts, options);
+	const width = options.width;
+	const height = options.height;
+	const bg = options.background;
+	if (bg) {
+		options.color = true;
+	}
+
+	const bgRect = bg ?
+		`<rect width="100%" height="100%" fill="${bg}"/>` : '';
+	const paths =
+		[].concat(getLineNoise(width, height, options))
+			.concat(getText(text, width, height, options))
+			.sort(() => Math.random() - 0.5)
+			.join('');
+	const start = `<svg xmlns="http://www.w3.org/2000/svg" width="${width}" height="${height}" viewBox="0,0,${width},${height}">`;
+	const xml = `${start}${bgRect}${paths}</svg>`;
+
+	return xml;
+};
+
+const create = function (options) {
+	const text = random.captchaText(options);
+	const data = createCaptcha(text, options);
+
+	return {text, data};
+};
+
+const createMathExpr = function (options) {
+	const expr = random.mathExpr(options.mathMin, options.mathMax, options.mathOperator);
+	const text = expr.text;
+	const data = createCaptcha(expr.equation, options);
+
+	return {text, data};
+};
+
+module.exports = createCaptcha;
+module.exports.randomText = random.captchaText;
+module.exports.create = create;
+module.exports.createMathExpr = createMathExpr;
+module.exports.options = opts;
+module.exports.loadFont = optionMngr.loadFont;