feat(frontend): add frontend-v2 modular architecture (Task 17)

- React 19 + TypeScript + Vite
- Module registration mechanism with dynamic loading
- Permission management system (basic/advanced/premium)
- Route guards for access control
- Error boundaries for module isolation
- 6 business module placeholders (AIA/ASL/PKB/DC/SSA/ST)
- Top navigation layout
- Tailwind CSS 3 + Ant Design 5

frontend-v2/src/modules/dc/index.tsx

@@ -0,0 +1,18 @@
+import Placeholder from '@/shared/components/Placeholder'
+
+const DCModule = () => {
+  return (
+    <Placeholder 
+      title="数据清洗模块"
+      description="功能规划中，将提供智能数据清洗和整理工具"
+      moduleName="DC - Data Cleaning"
+    />
+  )
+}
+
+export default DCModule
+
+
+
+
+