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/topthink/think-helper/tests/CollectionTest.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace Tests;
+
+use think\Collection;
+
+class CollectionTest extends TestCase
+{
+    public function testMerge()
+    {
+        $c = new Collection(['name' => 'Hello']);
+        $this->assertSame(['name' => 'Hello', 'id' => 1], $c->merge(['id' => 1])->all());
+    }
+
+    public function testFirst()
+    {
+        $c = new Collection(['name' => 'Hello', 'age' => 25]);
+
+        $this->assertSame('Hello', $c->first());
+    }
+
+    public function testLast()
+    {
+        $c = new Collection(['name' => 'Hello', 'age' => 25]);
+
+        $this->assertSame(25, $c->last());
+    }
+
+    public function testToArray()
+    {
+        $c = new Collection(['name' => 'Hello', 'age' => 25]);
+
+        $this->assertSame(['name' => 'Hello', 'age' => 25], $c->toArray());
+    }
+
+    public function testToJson()
+    {
+        $c = new Collection(['name' => 'Hello', 'age' => 25]);
+
+        $this->assertSame(json_encode(['name' => 'Hello', 'age' => 25]), $c->toJson());
+        $this->assertSame(json_encode(['name' => 'Hello', 'age' => 25]), (string) $c);
+        $this->assertSame(json_encode(['name' => 'Hello', 'age' => 25]), json_encode($c));
+    }
+
+    public function testSerialize()
+    {
+        $c = new Collection(['name' => 'Hello', 'age' => 25]);
+
+        $sc = serialize($c);
+        $c = unserialize($sc);
+
+        $this->assertSame(['name' => 'Hello', 'age' => 25], $c->all());
+    }
+
+    public function testGetIterator()
+    {
+        $c = new Collection(['name' => 'Hello', 'age' => 25]);
+
+        $this->assertInstanceOf(\ArrayIterator::class, $c->getIterator());
+
+        $this->assertSame(['name' => 'Hello', 'age' => 25], $c->getIterator()->getArrayCopy());
+    }
+
+    public function testCount()
+    {
+        $c = new Collection(['name' => 'Hello', 'age' => 25]);
+
+        $this->assertCount(2, $c);
+    }
+}