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/maennchen/zipstream-php/test/BigintTest.php

@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BigintTest;
+
+use OverflowException;
+use PHPUnit\Framework\TestCase;
+use ZipStream\Bigint;
+
+class BigintTest extends TestCase
+{
+    public function testConstruct(): void
+    {
+        $bigint = new Bigint(0x12345678);
+        $this->assertSame('0x0000000012345678', $bigint->getHex64());
+        $this->assertSame(0x12345678, $bigint->getLow32());
+        $this->assertSame(0, $bigint->getHigh32());
+    }
+
+    public function testConstructLarge(): void
+    {
+        $bigint = new Bigint(0x87654321);
+        $this->assertSame('0x0000000087654321', $bigint->getHex64());
+        $this->assertSame('87654321', bin2hex(pack('N', $bigint->getLow32())));
+        $this->assertSame(0, $bigint->getHigh32());
+    }
+
+    public function testAddSmallValue(): void
+    {
+        $bigint = new Bigint(1);
+        $bigint = $bigint->add(Bigint::init(2));
+        $this->assertSame(3, $bigint->getLow32());
+        $this->assertFalse($bigint->isOver32());
+        $this->assertTrue($bigint->isOver32(true));
+        $this->assertSame($bigint->getLowFF(), (float)$bigint->getLow32());
+        $this->assertSame($bigint->getLowFF(true), (float)0xFFFFFFFF);
+    }
+
+    public function testAddWithOverflowAtLowestByte(): void
+    {
+        $bigint = new Bigint(0xFF);
+        $bigint = $bigint->add(Bigint::init(0x01));
+        $this->assertSame(0x100, $bigint->getLow32());
+    }
+
+    public function testAddWithOverflowAtInteger32(): void
+    {
+        $bigint = new Bigint(0xFFFFFFFE);
+        $this->assertFalse($bigint->isOver32());
+        $bigint = $bigint->add(Bigint::init(0x01));
+        $this->assertTrue($bigint->isOver32());
+        $bigint = $bigint->add(Bigint::init(0x01));
+        $this->assertSame('0x0000000100000000', $bigint->getHex64());
+        $this->assertTrue($bigint->isOver32());
+        $this->assertSame((float)0xFFFFFFFF, $bigint->getLowFF());
+    }
+
+    public function testAddWithOverflowAtInteger64(): void
+    {
+        $bigint = Bigint::fromLowHigh(0xFFFFFFFF, 0xFFFFFFFF);
+        $this->assertSame('0xFFFFFFFFFFFFFFFF', $bigint->getHex64());
+        $this->expectException(OverflowException::class);
+        $bigint->add(Bigint::init(1));
+    }
+}