feat(assets): 将图片资源从 JPG/PNG 更新为 WebP 格式

- 将 MBTI 图标从 PNG 更改为 WebP 格式以优化加载性能
- 更新背景图片路径配置以使用 WebP 图片资源
- 移除对 sessionStorage 中图片 URL 列表的重复设置逻辑

about.html

@@ -171,7 +171,7 @@
                         <span class="mbti-code gradient-text">INFJ</span>
                         <span class="mbti-name" data-i18n="mbti.name">Advocate</span>
                         <span class="mbti-icon">
-                         <img src="images/INFJ.png" alt="INFJ" style="width:32px;height:32px;border-radius:50%;border:2px solid rgba(255,255,255,0.4)"/>
+                         <img src="images/INFJ.webp" alt="INFJ" style="width:32px;height:32px;border-radius:50%;border:2px solid rgba(255,255,255,0.4)"/>
                         </span>
                     </div>
                     <p class="mbti-desc" data-i18n="mbti.desc">"理想主义与道德感，果断决绝的行动力。深度洞察与创意，关怀与同理心。"</p>

js/config.js

@@ -18,13 +18,13 @@ const SiteConfig = {
   
   background: {
     imagePaths: [
-      "/images/bj/1.jpg",
-      "/images/bj/2.jpg",
-      "/images/bj/3.jpg",
-      "/images/bj/4.jpg",
-      "/images/bj/5.jpg",
-      "/images/bj/6.jpg",
-      "/images/bj/7.jpg"
+      "/images/bj/1.webp",
+      "/images/bj/2.webp",
+      "/images/bj/3.webp",
+      "/images/bj/4.webp",
+      "/images/bj/5.webp",
+      "/images/bj/6.webp",
+      "/images/bj/7.webp"
     ]
   },
   

js/main.js

@@ -50,17 +50,15 @@ $(document).ready(function () {
 	 *  自定义壁纸
 	 */
 	var imgUrls = JSON.parse(sessionStorage.getItem("imgUrls"));
-	var index = sessionStorage.getItem("index");
 	var $panel = $('#panel');
 	var date = new Date();
     var dayOfWeek = date.getDay();
 	if (imgUrls == null) {
 		imgUrls = [];
-		index = 0;
         SiteConfig.background.imagePaths.forEach(path => {
             imgUrls.push(path);
         });
-        sessionStorage.setItem("imgUrls", JSON.stringify(imgUrls));
+        //sessionStorage.setItem("imgUrls", JSON.stringify(imgUrls));
         // sessionStorage.setItem("index", index);
 	} else {
 //		if (index == imgUrls.length)