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/asl/index.tsx

@@ -0,0 +1,18 @@
+import Placeholder from '@/shared/components/Placeholder'
+
+const ASLModule = () => {
+  return (
+    <Placeholder 
+      title="AI智能文献模块"
+      description="Week 3 开始开发，支持4个LLM的智能文献筛选和分析"
+      moduleName="ASL - AI Smart Literature"
+    />
+  )
+}
+
+export default ASLModule
+
+
+
+
+