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/protocol-agent/components/ActionCard.tsx

@@ -0,0 +1,66 @@
+/**
+ * Action Card - Deep Link 动作卡片
+ * 
+ * 100%还原原型图Action Card设计
+ */
+
+import React from 'react';
+import { Calculator, ExternalLink, Rocket } from 'lucide-react';
+import type { ActionCard } from '../types';
+
+interface ActionCardProps {
+  card: ActionCard;
+}
+
+const CARD_ICONS: Record<string, React.ComponentType<any>> = {
+  sample_size_calculator: Calculator,
+  generate_protocol: Rocket,
+};
+
+export const ActionCardComponent: React.FC<ActionCardProps> = ({ card }) => {
+  const Icon = CARD_ICONS[card.id] || Calculator;
+
+  const handleClick = () => {
+    if (card.type === 'tool') {
+      // 打开工具页面（新标签页或模态框）
+      window.open(card.actionUrl, '_blank');
+    } else if (card.type === 'action') {
+      // 触发动作（如一键生成）
+      // 这里会被父组件处理
+      console.log('Action triggered:', card.id);
+    }
+  };
+
+  return (
+    <div className={`action-card ${card.type}`} onClick={handleClick}>
+      <div className="action-card-header">
+        <div className="action-icon-box">
+          <Icon size={20} />
+        </div>
+        <div className="action-info">
+          <h3 className="action-title">{card.title}</h3>
+          <p className="action-description">{card.description}</p>
+        </div>
+      </div>
+
+      {card.type === 'tool' && (
+        <div className="action-footer">
+          <button className="action-button">
+            <span>🚀 前往工具</span>
+            <ExternalLink size={14} />
+          </button>
+          <p className="action-hint">点击将打开工具面板，参数已自动预填</p>
+        </div>
+      )}
+
+      {card.type === 'action' && (
+        <button className="action-button primary">
+          <span>立即生成</span>
+          <Rocket size={14} />
+        </button>
+      )}
+    </div>
+  );
+};
+
+