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/schemas/pdi.py

@@ -0,0 +1,81 @@
+from pydantic import BaseModel
+from typing import Optional
+from datetime import datetime
+from app.models.pdi import L3Status, L2Status
+
+
+class PDIRecordCreate(BaseModel):
+    coil_no:          str
+    order_no:         Optional[str] = None
+    customer:         Optional[str] = None
+    steel_grade:      Optional[str] = None
+    thickness:        Optional[float] = None
+    width:            Optional[float] = None
+    target_thickness: Optional[float] = None
+    target_width:     Optional[float] = None
+    yield_strength:   Optional[float] = None
+    tensile_strength: Optional[float] = None
+    elongation:       Optional[float] = None
+    coil_weight:      Optional[float] = None
+    inner_diameter:   Optional[float] = None
+    outer_diameter:   Optional[float] = None
+    process_route:    Optional[str]   = None
+    priority:         Optional[int]   = 3
+    l3_status:        Optional[L3Status] = L3Status.pending
+    l2_status:        Optional[L2Status] = L2Status.pending
+    send_time:        Optional[datetime] = None
+    confirm_time:     Optional[datetime] = None
+    remark:           Optional[str] = None
+
+
+class PDIRecordUpdate(BaseModel):
+    order_no:         Optional[str] = None
+    customer:         Optional[str] = None
+    steel_grade:      Optional[str] = None
+    thickness:        Optional[float] = None
+    width:            Optional[float] = None
+    target_thickness: Optional[float] = None
+    target_width:     Optional[float] = None
+    yield_strength:   Optional[float] = None
+    tensile_strength: Optional[float] = None
+    elongation:       Optional[float] = None
+    coil_weight:      Optional[float] = None
+    inner_diameter:   Optional[float] = None
+    outer_diameter:   Optional[float] = None
+    process_route:    Optional[str]   = None
+    priority:         Optional[int]   = None
+    l3_status:        Optional[L3Status] = None
+    l2_status:        Optional[L2Status] = None
+    send_time:        Optional[datetime] = None
+    confirm_time:     Optional[datetime] = None
+    remark:           Optional[str] = None
+
+
+class PDIRecordOut(BaseModel):
+    id:               int
+    coil_no:          str
+    order_no:         Optional[str]
+    customer:         Optional[str]
+    steel_grade:      Optional[str]
+    thickness:        Optional[float]
+    width:            Optional[float]
+    target_thickness: Optional[float]
+    target_width:     Optional[float]
+    yield_strength:   Optional[float]
+    tensile_strength: Optional[float]
+    elongation:       Optional[float]
+    coil_weight:      Optional[float]
+    inner_diameter:   Optional[float]
+    outer_diameter:   Optional[float]
+    process_route:    Optional[str]
+    priority:         Optional[int]
+    l3_status:        Optional[L3Status]
+    l2_status:        Optional[L2Status]
+    send_time:        Optional[datetime]
+    confirm_time:     Optional[datetime]
+    remark:           Optional[str]
+    created_at:       datetime
+    updated_at:       Optional[datetime]
+
+    class Config:
+        from_attributes = True