feat: 移除PDI和订单号字段，新增设备巡检模块

- 从物料跟踪页面移除订单号列和表单字段
- 从导航菜单移除PDI管理，添加设备巡检
- 新增InspectionLocation和InspectionRecord后端模型和API
- 新增设备巡检前端页面（左侧点位列表，右侧设备和历史记录）

backend/app/models/__init__.py

@@ -0,0 +1,25 @@
+from app.models.user import User
+from app.models.material import Coil, MaterialTracking
+from app.models.production import ProductionRecord
+from app.models.plan import ProductionPlan
+from app.models.downtime import DowntimeRecord, DowntimeCategory
+from app.models.equipment import Equipment, EquipmentMaintenance
+from app.models.message import MessageLog
+from app.models.pdi import PDIRecord
+from app.models.quality import QualityRecord
+from app.models.energy import EnergyRecord
+from app.models.inspection import InspectionLocation, InspectionRecord
+
+__all__ = [
+    "User",
+    "Coil", "MaterialTracking",
+    "ProductionRecord",
+    "ProductionPlan",
+    "DowntimeRecord", "DowntimeCategory",
+    "Equipment", "EquipmentMaintenance",
+    "MessageLog",
+    "PDIRecord",
+    "QualityRecord",
+    "EnergyRecord",
+    "InspectionLocation", "InspectionRecord",
+]