feat(ai): Agent Tool 扩展 — QueryPatientProfile + DisplayHint 新增 3 变体

- QueryPatientProfileTool: 查询患者档案摘要（年龄/性别/慢性病/用药/家族史）
- DisplayHint 新增 TrendChart/InsightCard/PatientProfile 变体
- 沙箱: Patient + MedicalStaff 添加 query_patient_profile

crates/erp-ai/src/handler/chat_handler.rs

@@ -7,6 +7,7 @@ use serde::{Deserialize, Serialize};
 use crate::agent::orchestrator::AgentRunParams;
 use crate::agent::sandbox::{get_sandbox_config, resolve_role};
 use crate::agent::tool::ToolContext;
+use crate::agent::tools::QueryPatientProfileTool;
 use crate::agent::tools::QueryPatientVitalsTool;
 use crate::agent::tools::SearchMedicalKnowledgeTool;
 use crate::agent::tools::{QueryAppointmentsTool, QueryLabReportsTool, QueryMedicationsTool};
@@ -123,6 +124,7 @@ where
     registry.register(std::sync::Arc::new(QueryAppointmentsTool));
     registry.register(std::sync::Arc::new(QueryMedicationsTool));
     registry.register(std::sync::Arc::new(SearchMedicalKnowledgeTool));
+    registry.register(std::sync::Arc::new(QueryPatientProfileTool));
 
     // 根据用户角色获取沙箱配置
     let user_role = resolve_role(&ctx.roles);