docs: 增加“API接口参数签名”章节 视频讲解链接（B站抓蛙师）

sa-token-doc/plugin/api-sign.md

@@ -1,5 +1,9 @@
 # API 接口参数签名
 
+<p><a class="case-btn case-btn-video" href="https://www.bilibili.com/video/BV17oeKeZEHo/" target="_blank">
+	观看本节视频讲解（B站：抓蛙师）
+</a></p>
+
 在涉及跨系统接口调用时，我们容易碰到以下安全问题：
 
 - 请求身份被伪造。

sa-token-doc/static/doc.css

@@ -383,6 +383,12 @@ body {
 	background-size: 18px 18px;
 	background-image: url(icon/code.svg);
 }
+#main .case-btn,#main .case-btn-video{ 
+	background-color: #ECF5FF; 
+	color: #1979DA; 
+	border: 1px #1D7CF0 solid !important;
+	background-image: url(icon/video.svg);
+}
 #main .dt-btn{display: none;}
 
 

sa-token-doc/static/icon/video.svg

@@ -0,0 +1 @@
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