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/stainless-steel-heat-treatment.mdx

@@ -2,10 +2,10 @@
 title: Stainless Steel Continuous Annealing Pickling Line
 slug: stainless-steel-heat-treatment
 desc: The stainless steel continuous annealing pickling line is used for annealing and pickling various types of stainless steel to achieve the required mechanical properties and surface quality. It is mainly divided into hot-rolled stainless steel annealing pickling lines, cold-rolled stainless steel annealing pickling lines and cold-rolled stainless steel bright annealing lines. Our company has successively constructed ten such lines both domestically and overseas.
-cover: /images/stainless-steel-annealing-pickling-cover.png
+cover: /images/lines/line6.1.png
 images:
-  - /images/stainless-steel-annealing-pickling-1.png
-  - /images/stainless-steel-annealing-pickling-2.png
+  - /images/lines/line6.1.png
+  - /images/lines/line6.2.png
 properties: 
   - Welding Machine：Adopts a complete welding process of shearing → butt jointing → welding → punching → edge trimming. Both the inlet and outlet are equipped with automatic steel strip centering devices. The clamping devices feature uniform force application and adjustable pressure, with longitudinal and transverse movement functions, as well as the function of steel strip lap angle compensation.
   - High-pressure Hot Water Scrubbing and Rinsing：The water temperature is approximately 80℃, equipped with a hot water circulation system for rinsing. After degreasing treatment, it can ensure the surface cleanliness of the steel strip and meet the requirements of subsequent processes.