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/agent/tools/mod.rs

@@ -3,11 +3,13 @@
 pub mod query_appointments;
 pub mod query_lab_reports;
 pub mod query_medications;
+pub mod query_patient_profile;
 pub mod query_vitals;
 pub mod search_medical_knowledge;
 
 pub use query_appointments::QueryAppointmentsTool;
 pub use query_lab_reports::QueryLabReportsTool;
 pub use query_medications::QueryMedicationsTool;
+pub use query_patient_profile::QueryPatientProfileTool;
 pub use query_vitals::QueryPatientVitalsTool;
 pub use search_medical_knowledge::SearchMedicalKnowledgeTool;