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

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+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
+
+
+
+
+

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

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+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
+
+
+
+
+

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

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+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
+
+
+
+
+

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

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+import Placeholder from '@/shared/components/Placeholder'
+
+const PKBModule = () => {
+  return (
+    <Placeholder 
+      title="个人知识库模块"
+      description="后续基于新架构重写，提供更好的文档管理和智能检索"
+      moduleName="PKB - Personal Knowledge Base"
+    />
+  )
+}
+
+export default PKBModule
+
+
+
+
+

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

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+import React from 'react'
+import Placeholder from '../../shared/components/Placeholder'
+
+/**
+ * 智能统计分析模块
+ * Java团队开发，前端仅做导航集成
+ */
+const SSAModule: React.FC = () => {
+  return (
+    <Placeholder 
+      moduleName="智能统计分析" 
+      message="由Java团队开发中，前端集成规划中" 
+    />
+  )
+}
+
+export default SSAModule
+
+
+
+
+

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

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+import React from 'react'
+import Placeholder from '../../shared/components/Placeholder'
+
+/**
+ * 统计分析工具模块
+ * Java团队开发，前端仅做导航集成
+ */
+const STModule: React.FC = () => {
+  return (
+    <Placeholder 
+      moduleName="统计分析工具" 
+      message="由Java团队开发中，前端集成规划中" 
+    />
+  )
+}
+
+export default STModule
+
+
+
+
+