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/aia/index.tsx

@@ -0,0 +1,18 @@
+import Placeholder from '@/shared/components/Placeholder'
+
+const AIAModule = () => {
+  return (
+    <Placeholder 
+      title="AI智能问答模块"
+      description="后续基于新架构重写，提供更好的用户体验"
+      moduleName="AIA - AI Intelligent Assistant"
+    />
+  )
+}
+
+export default AIAModule
+
+
+
+
+