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/pdi.py

@@ -0,0 +1,112 @@
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select, func, desc
+from typing import Optional
+from datetime import datetime
+
+from app.database import get_db
+from app.models.pdi import PDIRecord, L3Status, L2Status
+from app.schemas.pdi import PDIRecordCreate, PDIRecordUpdate, PDIRecordOut
+from app.schemas.common import Response, PageResponse
+from app.services.auth_service import get_current_user
+
+router = APIRouter()
+
+
+@router.get("/stats", response_model=Response[dict])
+async def get_pdi_stats(
+    db: AsyncSession = Depends(get_db),
+    _=Depends(get_current_user),
+):
+    """各状态PDI数量统计"""
+    total_q   = await db.execute(select(func.count()).select_from(PDIRecord))
+    pending_q = await db.execute(
+        select(func.count()).select_from(PDIRecord).where(PDIRecord.l2_status == L2Status.pending)
+    )
+    proc_q    = await db.execute(
+        select(func.count()).select_from(PDIRecord).where(PDIRecord.l2_status == L2Status.processing)
+    )
+    done_q    = await db.execute(
+        select(func.count()).select_from(PDIRecord).where(PDIRecord.l2_status == L2Status.done)
+    )
+    confirmed_q = await db.execute(
+        select(func.count()).select_from(PDIRecord).where(PDIRecord.l3_status == L3Status.confirmed)
+    )
+
+    return Response.ok({
+        "total":     total_q.scalar(),
+        "pending":   pending_q.scalar(),
+        "processing": proc_q.scalar(),
+        "done":      done_q.scalar(),
+        "confirmed": confirmed_q.scalar(),
+    })
+
+
+@router.get("/", response_model=Response[PageResponse[PDIRecordOut]])
+async def list_pdi(
+    page:       int = 1,
+    page_size:  int = 20,
+    coil_no:    Optional[str] = None,
+    l3_status:  Optional[str] = None,
+    l2_status:  Optional[str] = None,
+    db: AsyncSession = Depends(get_db),
+    _=Depends(get_current_user),
+):
+    query = select(PDIRecord).order_by(desc(PDIRecord.created_at))
+    if coil_no:
+        query = query.where(PDIRecord.coil_no.ilike(f"%{coil_no}%"))
+    if l3_status:
+        query = query.where(PDIRecord.l3_status == l3_status)
+    if l2_status:
+        query = query.where(PDIRecord.l2_status == l2_status)
+
+    total  = (await db.execute(select(func.count()).select_from(query.subquery()))).scalar()
+    result = await db.execute(query.offset((page - 1) * page_size).limit(page_size))
+    items  = [PDIRecordOut.model_validate(r) for r in result.scalars()]
+    return Response.ok(PageResponse(total=total, page=page, page_size=page_size, items=items))
+
+
+@router.post("/", response_model=Response[PDIRecordOut])
+async def create_pdi(
+    body: PDIRecordCreate,
+    db: AsyncSession = Depends(get_db),
+    _=Depends(get_current_user),
+):
+    record = PDIRecord(**body.model_dump())
+    db.add(record)
+    await db.flush()
+    return Response.ok(PDIRecordOut.model_validate(record))
+
+
+@router.put("/{pdi_id}", response_model=Response[PDIRecordOut])
+async def update_pdi(
+    pdi_id: int,
+    body: PDIRecordUpdate,
+    db: AsyncSession = Depends(get_db),
+    _=Depends(get_current_user),
+):
+    result = await db.execute(select(PDIRecord).where(PDIRecord.id == pdi_id))
+    record = result.scalar_one_or_none()
+    if not record:
+        raise HTTPException(status_code=404, detail="PDI记录不存在")
+    for k, v in body.model_dump(exclude_none=True).items():
+        setattr(record, k, v)
+    await db.flush()
+    return Response.ok(PDIRecordOut.model_validate(record))
+
+
+@router.patch("/{pdi_id}/confirm", response_model=Response[PDIRecordOut])
+async def confirm_pdi(
+    pdi_id: int,
+    db: AsyncSession = Depends(get_db),
+    _=Depends(get_current_user),
+):
+    """L2确认PDI，将状态设置为processing"""
+    result = await db.execute(select(PDIRecord).where(PDIRecord.id == pdi_id))
+    record = result.scalar_one_or_none()
+    if not record:
+        raise HTTPException(status_code=404, detail="PDI记录不存在")
+    record.l2_status    = L2Status.processing
+    record.confirm_time = datetime.utcnow()
+    await db.flush()
+    return Response.ok(PDIRecordOut.model_validate(record))