feat(health): BLE 网关后端接入 — 网关管理 + API Key 认证 + 多患者批量上报

- 新增 ble_gateways + gateway_patient_bindings 表迁移 (000113)
- 网关 CRUD：注册/编辑/删除/重生成 API Key，含患者绑定管理
- API Key 认证中间件（SHA-256 hash + prefix 快速查找）
- 网关数据上报端点：多患者批量读数，复用 device_reading_service 管道
- 网关心跳端点：固件版本/IP 更新 + last_heartbeat_at
- 10 个管理端路由（JWT）+ 2 个网关端路由（API Key）
- health.ble-gateways.list/manage 权限声明
- 修复 000112 迁移 ForeignKey 借用错误

crates/erp-server/migration/src/m20260505_000112_create_shift_management.rs

@@ -85,7 +85,7 @@ impl MigrationTrait for Migration {
 
         manager
             .create_foreign_key(
-                &mut ForeignKey::create()
+                ForeignKey::create()
                     .name("fk_patient_assignments_shift")
                     .from(PatientAssignment::Table, PatientAssignment::ShiftId)
                     .to(Shift::Table, Shift::Id)
@@ -147,7 +147,7 @@ impl MigrationTrait for Migration {
 
         manager
             .create_foreign_key(
-                &mut ForeignKey::create()
+                ForeignKey::create()
                     .name("fk_handoff_log_from_shift")
                     .from(HandoffLog::Table, HandoffLog::FromShiftId)
                     .to(Shift::Table, Shift::Id)
@@ -158,7 +158,7 @@ impl MigrationTrait for Migration {
 
         manager
             .create_foreign_key(
-                &mut ForeignKey::create()
+                ForeignKey::create()
                     .name("fk_handoff_log_to_shift")
                     .from(HandoffLog::Table, HandoffLog::ToShiftId)
                     .to(Shift::Table, Shift::Id)