feat(aia): Complete AIA V2.0 with universal streaming capabilities

Major Updates:
- Add StreamingService with OpenAI Compatible format (backend/common/streaming)
- Upgrade Chat component V2 with Ant Design X integration
- Implement AIA module with 12 intelligent agents
- Create AgentHub with 100% prototype V11 restoration
- Create ChatWorkspace with streaming response support
- Add ThinkingBlock for deep thinking display
- Add useAIStream Hook for OpenAI Compatible stream handling

Backend Common Capabilities (~400 lines):
- OpenAIStreamAdapter: SSE adapter with OpenAI format
- StreamingService: unified streaming service
- Support content and reasoning_content dual streams
- Deep thinking tag processing (<think>...</think>)

Frontend Common Capabilities (~2000 lines):
- AIStreamChat: modern streaming chat component
- ThinkingBlock: collapsible deep thinking display
- ConversationList: conversation management with grouping
- useAIStream: OpenAI Compatible stream handler Hook
- useConversations: conversation state management Hook
- Modern design styles (Ultramodern theme)

AIA Module Frontend (~1500 lines):
- AgentHub: 12 agent cards with timeline design
- ChatWorkspace: fullscreen immersive chat interface
- AgentCard: theme-colored cards (blue/yellow/teal/purple)
- 5 phases, 12 agents configuration
- Responsive layout (desktop + mobile)

AIA Module Backend (~900 lines):
- agentService: 12 agents config with system prompts
- conversationService: refactored with StreamingService
- attachmentService: file upload skeleton (30k token limit)
- 12 API endpoints with authentication
- Full CRUD for conversations and messages

Documentation:
- AIA module status and development guide
- Universal capabilities catalog (11 services)
- Quick reference card for developers
- System overview updates

Testing:
- Stream response verified (HTTP 200)
- Authentication working correctly
- Auto conversation creation working
- Deep thinking display working
- Message input and send working

Status: Core features completed (85%), attachment and history loading pending

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

@@ -1,30 +1,50 @@
-import Placeholder from '@/shared/components/Placeholder'
+/**
+ * AIA - AI Intelligent Assistant 模块入口
+ * 
+ * 视图管理：
+ * - Hub: 智能体大厅（12个模块展示）
+ * - Chat: 沉浸式对话工作台
+ */
+
+import React, { useState } from 'react';
+import { AgentHub } from './components/AgentHub';
+import { ChatWorkspace } from './components/ChatWorkspace';
+import type { AgentConfig } from './types';
+
+const AIAModule: React.FC = () => {
+  const [currentView, setCurrentView] = useState<'hub' | 'chat'>('hub');
+  const [selectedAgent, setSelectedAgent] = useState<AgentConfig | null>(null);
+  const [initialQuery, setInitialQuery] = useState<string | undefined>();
+
+  // 选择智能体，进入对话
+  const handleAgentSelect = (agent: AgentConfig & { initialQuery?: string }) => {
+    setSelectedAgent(agent);
+    setInitialQuery(agent.initialQuery);
+    setCurrentView('chat');
+  };
+
+  // 返回大厅
+  const handleBack = () => {
+    setCurrentView('hub');
+    setSelectedAgent(null);
+    setInitialQuery(undefined);
+  };
 
-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
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
+    <>
+      {currentView === 'hub' && (
+        <AgentHub onAgentSelect={handleAgentSelect} />
+      )}
+      
+      {currentView === 'chat' && selectedAgent && (
+        <ChatWorkspace
+          agent={selectedAgent}
+          initialQuery={initialQuery}
+          onBack={handleBack}
+        />
+      )}
+    </>
+  );
+};
 
+export default AIAModule;