chore: sync marketing pages, CMS extensions, tests and project docs

同步工作区剩余变更，主要包括：
- 营销页面组件与布局持续优化（about/news/services/solutions/team 等）
- 详情页四层叙事组件、布局组件、UI 组件调整
- CMS 数据模型、API 路由、权限、工作流、站内通知、媒体管理扩展
- 新增/补充单元测试与 E2E 测试（cms-workflow.spec.ts 等）
- ESLint 9 迁移、jest/tsconfig 配置更新、依赖调整
- 新增 ADR、CMS 评估文档、Release Review / Acceptance 报告
- 移除水墨装饰组件与大体积未使用字体文件

src/components/layout/mega-dropdown.tsx

@@ -38,12 +38,6 @@ export function MegaDropdown({ label, groups, isOpen, isActive, onToggle, onOpen
       <div className="-mx-2 px-2 py-2">
         <button
           onClick={onToggle}
-          onKeyDown={(e) => {
-            if (e.key === 'Enter' || e.key === ' ') {
-              e.preventDefault();
-              onToggle();
-            }
-          }}
           className={`
             relative flex items-center gap-1 px-3 py-2 text-sm font-medium
             transition-all duration-300 ease-out
@@ -96,16 +90,9 @@ export function MegaDropdown({ label, groups, isOpen, isActive, onToggle, onOpen
                   </div>
                   
                   <div className={`grid gap-2 ${group.items.length > 4 ? 'grid-cols-3' : 'grid-cols-2'}`}>
-                    {group.items.map((item) => (
-                      <StaticLink
-                        key={item.id}
-                        href={item.href}
-                        className={`block p-3 border transition-all duration-300 ease-out group ${
-                          item.href === '#'
-                            ? 'border-border-primary bg-bg-secondary cursor-not-allowed opacity-50'
-                            : 'border-transparent hover:border-border-primary hover:bg-bg-secondary'
-                        }`}
-                      >
+                    {group.items.map((item) => {
+                      const isPlaceholder = item.href === '#';
+                      const content = (
                         <div className="flex items-start justify-between gap-2">
                           <div className="flex-1 min-w-0">
                             <div className="flex items-center gap-2">
@@ -124,8 +111,30 @@ export function MegaDropdown({ label, groups, isOpen, isActive, onToggle, onOpen
                             <div className="text-xs text-text-secondary mt-1 leading-relaxed">{item.description}</div>
                           </div>
                         </div>
-                      </StaticLink>
-                    ))}
+                      );
+
+                      if (isPlaceholder) {
+                        return (
+                          <div
+                            key={item.id}
+                            className="block p-3 border border-border-primary bg-bg-secondary cursor-not-allowed opacity-50"
+                            aria-disabled="true"
+                          >
+                            {content}
+                          </div>
+                        );
+                      }
+
+                      return (
+                        <StaticLink
+                          key={item.id}
+                          href={item.href}
+                          className="block p-3 border border-transparent transition-all duration-300 ease-out group hover:border-border-primary hover:bg-bg-secondary"
+                        >
+                          {content}
+                        </StaticLink>
+                      );
+                    })}
                   </div>
                 </div>
               ))}