feat(banner): 替换为高端大气纯净3D科技艺术主视觉，彻底移除繁杂文字与UI截图，并调优通透遮罩

public/assets/addons/official/css/modern_nhc.css

@@ -386,29 +386,29 @@ img {
   z-index: 2;
 }
 
-/* 轮播图幻灯片不同主题背景与中式意境光影 (浅色高雅、通透羽化、右侧鲜明视窗完全释放) */
+/* 轮播图幻灯片不同主题背景与中式意境光影 (高端大气现代科技主视觉，纯净无杂乱文字，右侧通透绽放) */
 .nhc-slide-theme-1 {
   background: 
-    linear-gradient(90deg, #FFFFFF 0%, rgba(255, 255, 255, 0.98) 36%, rgba(255, 255, 255, 0.82) 44%, rgba(255, 255, 255, 0) 54%, rgba(255, 255, 255, 0) 100%),
-    url('../images/banners/banner_lead.svg') right center / cover no-repeat;
+    linear-gradient(90deg, #FFFFFF 0%, rgba(255, 255, 255, 0.95) 30%, rgba(255, 255, 255, 0.6) 42%, rgba(255, 255, 255, 0) 52%, rgba(255, 255, 255, 0) 100%),
+    url('../images/banners/banner_lead.jpg') right center / cover no-repeat;
 }
 
 .nhc-slide-theme-2 {
   background: 
-    linear-gradient(90deg, #FFFFFF 0%, rgba(255, 255, 255, 0.98) 36%, rgba(255, 255, 255, 0.82) 44%, rgba(255, 255, 255, 0) 54%, rgba(255, 255, 255, 0) 100%),
-    url('../images/banners/banner_craft.svg') right center / cover no-repeat;
+    linear-gradient(90deg, #FFFFFF 0%, rgba(255, 255, 255, 0.95) 30%, rgba(255, 255, 255, 0.6) 42%, rgba(255, 255, 255, 0) 52%, rgba(255, 255, 255, 0) 100%),
+    url('../images/banners/banner_craft.jpg') right center / cover no-repeat;
 }
 
 .nhc-slide-theme-3 {
   background: 
-    linear-gradient(90deg, #FFFFFF 0%, rgba(255, 255, 255, 0.98) 36%, rgba(255, 255, 255, 0.82) 44%, rgba(255, 255, 255, 0) 54%, rgba(255, 255, 255, 0) 100%),
-    url('../images/banners/banner_agent.svg') right center / cover no-repeat;
+    linear-gradient(90deg, #FFFFFF 0%, rgba(255, 255, 255, 0.95) 30%, rgba(255, 255, 255, 0.6) 42%, rgba(255, 255, 255, 0) 52%, rgba(255, 255, 255, 0) 100%),
+    url('../images/banners/banner_agent.jpg') right center / cover no-repeat;
 }
 
 .nhc-slide-theme-4 {
   background: 
-    linear-gradient(90deg, #FFFFFF 0%, rgba(255, 255, 255, 0.98) 36%, rgba(255, 255, 255, 0.82) 44%, rgba(255, 255, 255, 0) 54%, rgba(255, 255, 255, 0) 100%),
-    url('../images/banners/banner_matrix.svg') right center / cover no-repeat;
+    linear-gradient(90deg, #FFFFFF 0%, rgba(255, 255, 255, 0.95) 30%, rgba(255, 255, 255, 0.6) 42%, rgba(255, 255, 255, 0) 52%, rgba(255, 255, 255, 0) 100%),
+    url('../images/banners/banner_matrix.jpg') right center / cover no-repeat;
 }
 
 /* 轮播图切换过渡微动画 */
@@ -1662,23 +1662,23 @@ img {
   }
   .nhc-slide-theme-1 {
     background: 
-      linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 255, 255, 0.90) 65%, rgba(255, 255, 255, 0.70) 100%),
-      url('../images/banners/banner_lead.svg') 80% center / cover no-repeat;
+      linear-gradient(180deg, rgba(255, 255, 255, 0.94) 0%, rgba(255, 255, 255, 0.88) 60%, rgba(255, 255, 255, 0.65) 100%),
+      url('../images/banners/banner_lead.jpg') 80% center / cover no-repeat;
   }
   .nhc-slide-theme-2 {
     background: 
-      linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 255, 255, 0.90) 65%, rgba(255, 255, 255, 0.70) 100%),
-      url('../images/banners/banner_craft.svg') 80% center / cover no-repeat;
+      linear-gradient(180deg, rgba(255, 255, 255, 0.94) 0%, rgba(255, 255, 255, 0.88) 60%, rgba(255, 255, 255, 0.65) 100%),
+      url('../images/banners/banner_craft.jpg') 80% center / cover no-repeat;
   }
   .nhc-slide-theme-3 {
     background: 
-      linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 255, 255, 0.90) 65%, rgba(255, 255, 255, 0.70) 100%),
-      url('../images/banners/banner_agent.svg') 80% center / cover no-repeat;
+      linear-gradient(180deg, rgba(255, 255, 255, 0.94) 0%, rgba(255, 255, 255, 0.88) 60%, rgba(255, 255, 255, 0.65) 100%),
+      url('../images/banners/banner_agent.jpg') 80% center / cover no-repeat;
   }
   .nhc-slide-theme-4 {
     background: 
-      linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 255, 255, 0.90) 65%, rgba(255, 255, 255, 0.70) 100%),
-      url('../images/banners/banner_matrix.svg') 80% center / cover no-repeat;
+      linear-gradient(180deg, rgba(255, 255, 255, 0.94) 0%, rgba(255, 255, 255, 0.88) 60%, rgba(255, 255, 255, 0.65) 100%),
+      url('../images/banners/banner_matrix.jpg') 80% center / cover no-repeat;
   }
   .nhc-hero-title {
     font-size: 32px;