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/message.py

@@ -0,0 +1,20 @@
+from sqlalchemy import Column, Integer, String, DateTime, Text, Float, func
+from app.database import Base
+
+
+class MessageLog(Base):
+    """L1报文日志"""
+    __tablename__ = "message_logs"
+
+    id = Column(Integer, primary_key=True, index=True)
+    msg_id = Column(String(50), index=True, comment="报文ID")
+    msg_type = Column(String(30), index=True, comment="报文类型")
+    direction = Column(String(10), comment="方向: recv/send")
+    source = Column(String(50), comment="来源系统")
+    raw_data = Column(Text, comment="原始报文")
+    parsed_data = Column(Text, comment="解析结果JSON")
+    status = Column(String(20), default="success", comment="处理状态: success/error")
+    error_msg = Column(Text, comment="错误信息")
+    process_time = Column(Float, comment="处理耗时ms")
+    received_at = Column(DateTime, nullable=False, index=True)
+    created_at = Column(DateTime, server_default=func.now())