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/api/dashboard.py

@@ -0,0 +1,55 @@
+from fastapi import APIRouter, Depends
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select, func
+from datetime import datetime, date
+
+from app.database import get_db
+from app.models.material import Coil, CoilStatus
+from app.models.production import ProductionRecord
+from app.models.downtime import DowntimeRecord
+from app.models.equipment import Equipment, EquipmentStatus
+from app.schemas.common import Response
+from app.services.auth_service import get_current_user
+
+router = APIRouter()
+
+
+@router.get("/summary", response_model=Response[dict])
+async def get_summary(db: AsyncSession = Depends(get_db), _ = Depends(get_current_user)):
+    today = datetime.combine(date.today(), datetime.min.time())
+
+    # 今日产量
+    prod_result = await db.execute(
+        select(func.count(), func.sum(ProductionRecord.process_weight))
+        .where(ProductionRecord.start_time >= today)
+    )
+    prod_count, prod_weight = prod_result.one()
+
+    # 在线钢卷数
+    online_result = await db.execute(
+        select(func.count()).where(Coil.status == CoilStatus.ON_LINE)
+    )
+    online_coils = online_result.scalar()
+
+    # 今日停机时长
+    downtime_result = await db.execute(
+        select(func.sum(DowntimeRecord.duration))
+        .where(DowntimeRecord.start_time >= today)
+    )
+    total_downtime = downtime_result.scalar() or 0
+
+    # 设备状态统计
+    equip_result = await db.execute(
+        select(Equipment.status, func.count()).group_by(Equipment.status)
+    )
+    equip_stats = {str(row[0]): row[1] for row in equip_result}
+
+    return Response.ok({
+        "today_production": {
+            "coil_count": prod_count or 0,
+            "weight_kg": float(prod_weight or 0),
+        },
+        "online_coils": online_coils or 0,
+        "today_downtime_min": float(total_downtime),
+        "equipment_status": equip_stats,
+    })