feat: 更新产品图片和内容，优化首页展示

- 新增产品线相关图片资源
- 更新中英文产品内容中的图片引用路径
- 简化首页标题并移除应用领域板块
- 优化产品中心展示内容
- 更新公司描述信息

content/lines/en/zinc.mdx

@@ -2,10 +2,10 @@
 title: Hot-dip Galvanizing / Galvalume Coating Line
 slug: zinc
 desc: Hot-dip galvanizing/galvalume coating refers to covering a layer of zinc or zinc-aluminum alloy on the surface of steel strip via the hot-dip coating method. It features strong cathodic protection performance, enabling it to be widely used in various fields such as industry, agriculture and construction, and has become one of the most extensively applied coating products nowadays.
-cover: /images/zinc-cover.png
+cover: /images/lines/line1.1.png
 images:
-  - /images/zinc-1.png
-  - /images/zinc-2.png
+  - /images/lines/line1.1.png
+  - /images/lines/line1.2.png
 properties: 
   - Line Types：Horizontal type, vertical type, combined horizontal-vertical type
   - Processing Specification/Thickness：Cold-rolled strip / min 0.12mm, max 2.5mm; Hot-rolled strip / min 1.5mm, max 5mm