优化解决方案幻灯片样式：增大图片尺寸并移除圆角

- 图片宽度从 400px 增加到 500px
- 图片高度从 350px 增加到 400px
- 移除 .solution-content 的圆角 (border-radius: 0)
- 移除 .solution-image 的圆角 (border-radius: 0)
- 打造更加简洁大气的视觉效果

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

css/index.css

@@ -2732,7 +2732,7 @@ html {
   background: rgba(15, 23, 42, 0.7);
   backdrop-filter: blur(16px);
   border: 1px solid rgba(148, 163, 184, 0.15);
-  border-radius: 20px;
+  border-radius: 0;
   box-shadow:
     0 8px 32px rgba(15, 23, 42, 0.5),
     inset 0 1px 0 rgba(255, 255, 255, 0.05);
@@ -2809,11 +2809,11 @@ html {
 /* 右侧图片区域 */
 .solution-image {
   flex-shrink: 0;
-  width: 400px;
-  height: 350px;
+  width: 500px;
+  height: 400px;
   position: relative;
   overflow: hidden;
-  border-radius: 16px;
+  border-radius: 0;
   background: rgba(15, 23, 42, 0.5);
 }