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/equipment.py

@@ -0,0 +1,79 @@
+from pydantic import BaseModel
+from typing import Optional
+from datetime import datetime
+from app.models.equipment import EquipmentStatus
+
+
+class EquipmentCreate(BaseModel):
+    code: str
+    name: str
+    category: Optional[str] = None
+    model: Optional[str] = None
+    manufacturer: Optional[str] = None
+    install_date: Optional[datetime] = None
+    location: Optional[str] = None
+    rated_power: Optional[float] = None
+    remark: Optional[str] = None
+
+
+class EquipmentUpdate(BaseModel):
+    name: Optional[str] = None
+    category: Optional[str] = None
+    model: Optional[str] = None
+    location: Optional[str] = None
+    status: Optional[EquipmentStatus] = None
+    remark: Optional[str] = None
+
+
+class EquipmentOut(BaseModel):
+    id: int
+    code: str
+    name: str
+    category: Optional[str]
+    model: Optional[str]
+    manufacturer: Optional[str]
+    install_date: Optional[datetime]
+    location: Optional[str]
+    status: EquipmentStatus
+    rated_power: Optional[float]
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class MaintenanceCreate(BaseModel):
+    equipment_id: int
+    equipment_code: Optional[str] = None
+    maintenance_type: str
+    title: str
+    description: Optional[str] = None
+    start_time: datetime
+    end_time: Optional[datetime] = None
+    duration: Optional[float] = None
+    cost: Optional[float] = None
+    spare_parts: Optional[str] = None
+    technician: Optional[str] = None
+    approver: Optional[str] = None
+    next_maintenance: Optional[datetime] = None
+    result: Optional[str] = None
+    remark: Optional[str] = None
+
+
+class MaintenanceOut(BaseModel):
+    id: int
+    equipment_id: int
+    equipment_code: Optional[str]
+    maintenance_type: str
+    title: str
+    description: Optional[str]
+    start_time: datetime
+    end_time: Optional[datetime]
+    duration: Optional[float]
+    cost: Optional[float]
+    technician: Optional[str]
+    result: Optional[str]
+    created_at: datetime
+
+    class Config:
+        from_attributes = True