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/inspection.py

@@ -0,0 +1,28 @@
+from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, func
+from app.database import Base
+
+
+class InspectionLocation(Base):
+    __tablename__ = "inspection_locations"
+
+    id = Column(Integer, primary_key=True, index=True)
+    code = Column(String(30), unique=True, nullable=False, index=True)
+    name = Column(String(100), nullable=False)
+    description = Column(Text)
+    sort_order = Column(Integer, default=0)
+    created_at = Column(DateTime, server_default=func.now())
+
+
+class InspectionRecord(Base):
+    __tablename__ = "inspection_records"
+
+    id = Column(Integer, primary_key=True, index=True)
+    location_id = Column(Integer, ForeignKey("inspection_locations.id"), nullable=False)
+    location_name = Column(String(100))
+    equipment_code = Column(String(30), index=True)
+    equipment_name = Column(String(100))
+    scan_code = Column(String(200))
+    inspector = Column(String(50), nullable=False)
+    result = Column(String(20), default="normal")
+    notes = Column(Text)
+    created_at = Column(DateTime, server_default=func.now())