feat(aia): Implement Protocol Agent MVP with reusable Agent framework

Sprint 1-3 Completed (Backend + Frontend):

Backend (Sprint 1-2):
- Implement 5-layer Agent framework (Query->Planner->Executor->Tools->Reflection)
- Create agent_schema with 6 tables (agent_definitions, stages, prompts, sessions, traces, reflexion_rules)
- Create protocol_schema with 2 tables (protocol_contexts, protocol_generations)
- Implement Protocol Agent core services (Orchestrator, ContextService, PromptBuilder)
- Integrate LLM service adapter (DeepSeek/Qwen/GPT-5/Claude)
- 6 API endpoints with full authentication
- 10/10 API tests passed

Frontend (Sprint 3):
- Add Protocol Agent entry in AgentHub (indigo theme card)
- Implement ProtocolAgentPage with 3-column layout
- Collapsible sidebar (Gemini style, 48px <-> 280px)
- StatePanel with 5 stage cards (scientific_question, pico, study_design, sample_size, endpoints)
- ChatArea with sync button and action cards integration
- 100% prototype design restoration (608 lines CSS)
- Detailed endpoints structure: baseline, exposure, outcomes, confounders

Features:
- 5-stage dialogue flow for research protocol design
- Conversation-driven interaction with sync-to-protocol button
- Real-time context state management
- One-click protocol generation button (UI ready, backend pending)

Database:
- agent_schema: 6 tables for reusable Agent framework
- protocol_schema: 2 tables for Protocol Agent
- Seed data: 1 agent + 5 stages + 9 prompts + 4 reflexion rules

Code Stats:
- Backend: 13 files, 4338 lines
- Frontend: 14 files, 2071 lines
- Total: 27 files, 6409 lines

Status: MVP core functionality completed, pending frontend-backend integration testing

Next: Sprint 4 - One-click protocol generation + Word export

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

@@ -1,49 +1,80 @@
 /**
  * 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
+ * 路由管理：
+ * - /aia -> Hub: 智能体大厅（12个模块展示）
+ * - /aia/chat -> Chat: 沉浸式对话工作台（原12个智能体）
+ * - /aia/protocol-agent/:conversationId? -> Protocol Agent（全流程方案制定）
  */
 
 import React, { useState } from 'react';
+import { Routes, Route, useNavigate, useLocation } from 'react-router-dom';
 import { AgentHub } from './components/AgentHub';
 import { ChatWorkspace } from './components/ChatWorkspace';
+import { ProtocolAgentPage } from './protocol-agent';
 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>();
+  return (
+    <Routes>
+      {/* 智能体大厅 */}
+      <Route index element={<AIAHub />} />
+      
+      {/* Protocol Agent（全流程研究方案制定） */}
+      <Route path="protocol-agent/:conversationId?" element={<ProtocolAgentPage />} />
+      
+      {/* 传统智能体对话（向后兼容） */}
+      <Route path="chat" element={<AIAChat />} />
+    </Routes>
+  );
+};
+
+/**
+ * Hub 页面
+ */
+const AIAHub: React.FC = () => {
+  const navigate = useNavigate();
 
-  // 选择智能体，进入对话
   const handleAgentSelect = (agent: AgentConfig & { initialQuery?: string }) => {
-    setSelectedAgent(agent);
-    setInitialQuery(agent.initialQuery);
-    setCurrentView('chat');
+    console.log('[AIAHub] Agent selected:', agent.id, 'isProtocolAgent:', agent.isProtocolAgent);
+    
+    if (agent.isProtocolAgent) {
+      // Protocol Agent：跳转专属页面
+      console.log('[AIAHub] Navigating to /aia/protocol-agent');
+      navigate('/aia/protocol-agent');
+    } else {
+      // 传统智能体：跳转对话页面
+      console.log('[AIAHub] Navigating to /aia/chat');
+      navigate('/aia/chat', { state: { agent, initialQuery: agent.initialQuery } });
+    }
   };
 
-  // 返回大厅
+  return <AgentHub onAgentSelect={handleAgentSelect} />;
+};
+
+/**
+ * 传统智能体对话页面
+ */
+const AIAChat: React.FC = () => {
+  const navigate = useNavigate();
+  const location = useLocation();
+  const state = location.state as { agent: AgentConfig; initialQuery?: string } | null;
+
   const handleBack = () => {
-    setCurrentView('hub');
-    setSelectedAgent(null);
-    setInitialQuery(undefined);
+    navigate('/aia');
   };
 
+  if (!state?.agent) {
+    navigate('/aia');
+    return null;
+  }
+
   return (
-    <>
-      {currentView === 'hub' && (
-        <AgentHub onAgentSelect={handleAgentSelect} />
-      )}
-      
-      {currentView === 'chat' && selectedAgent && (
-        <ChatWorkspace
-          agent={selectedAgent}
-          initialQuery={initialQuery}
-          onBack={handleBack}
-        />
-      )}
-    </>
+    <ChatWorkspace
+      agent={state.agent}
+      initialQuery={state.initialQuery}
+      onBack={handleBack}
+    />
   );
 };