chore: 添加缺失的静态资源文件

添加多个前端界面所需的图片、字体、音频等静态资源文件，包括：
- 管理员后台的图标、背景图、组件图片
- 移动端页面的商品图片、用户中心图片、活动图标
- 第三方库的示例图片和字体文件
- 浏览器兼容性配置文件
- 图标字体文件（eot、ttf、woff、woff2格式）

这些资源是前端界面正常显示所必需的，之前可能因版本控制忽略或遗漏而缺失。

vendor/symfony/mime/Header/HeaderInterface.php

@@ -0,0 +1,61 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Mime\Header;
+
+/**
+ * A MIME Header.
+ *
+ * @author Chris Corbyn
+ */
+interface HeaderInterface
+{
+    /**
+     * Sets the body.
+     *
+     * The type depends on the Header concrete class.
+     */
+    public function setBody(mixed $body);
+
+    /**
+     * Gets the body.
+     *
+     * The return type depends on the Header concrete class.
+     */
+    public function getBody(): mixed;
+
+    public function setCharset(string $charset);
+
+    public function getCharset(): ?string;
+
+    public function setLanguage(string $lang);
+
+    public function getLanguage(): ?string;
+
+    public function getName(): string;
+
+    public function setMaxLineLength(int $lineLength);
+
+    public function getMaxLineLength(): int;
+
+    /**
+     * Gets this Header rendered as a compliant string.
+     */
+    public function toString(): string;
+
+    /**
+     * Gets the header's body, prepared for folding into a final header value.
+     *
+     * This is not necessarily RFC 2822 compliant since folding white space is
+     * not added at this stage (see {@link toString()} for that).
+     */
+    public function getBodyAsString(): string;
+}