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/plan.py

@@ -0,0 +1,48 @@
+from pydantic import BaseModel
+from typing import Optional
+from datetime import datetime
+from app.models.plan import PlanStatus
+
+
+class PlanCreate(BaseModel):
+    plan_no: str
+    plan_date: datetime
+    shift: Optional[str] = None
+    plan_quantity: int = 0
+    plan_weight: float = 0
+    steel_grade: Optional[str] = None
+    spec_range: Optional[str] = None
+    priority: int = 5
+    remark: Optional[str] = None
+
+
+class PlanUpdate(BaseModel):
+    plan_date: Optional[datetime] = None
+    shift: Optional[str] = None
+    plan_quantity: Optional[int] = None
+    plan_weight: Optional[float] = None
+    actual_quantity: Optional[int] = None
+    actual_weight: Optional[float] = None
+    status: Optional[PlanStatus] = None
+    priority: Optional[int] = None
+    remark: Optional[str] = None
+
+
+class PlanOut(BaseModel):
+    id: int
+    plan_no: str
+    plan_date: datetime
+    shift: Optional[str]
+    plan_quantity: int
+    plan_weight: float
+    actual_quantity: int
+    actual_weight: float
+    status: PlanStatus
+    steel_grade: Optional[str]
+    spec_range: Optional[str]
+    priority: int
+    created_by: Optional[str]
+    created_at: datetime
+
+    class Config:
+        from_attributes = True