"feat: 1-实现动态层级树形库位管理功能

2 - 首页新增库位设置按钮和树形管理弹窗
     3 - 后端添加 SysWarehouseLocation 模型和 CRUD API
     4 - 树形结构支持无限层级，自动计算 full_path
     5 - 修复 product.vue 中 defaultColumns 未定义 bug

inventory-backend/app/models/system.py

@@ -148,4 +148,39 @@ class SysRolePermission(db.Model):
     id = db.Column(db.Integer, primary_key=True)
     role_code = db.Column(db.String(50), nullable=False)
     target_code = db.Column(db.String(100), nullable=False)  # menu_code 或 element_code
-    type = db.Column(db.String(20), nullable=False)  # 'menu' 或 'element'
+    type = db.Column(db.String(20), nullable=False)  # 'menu' 或 'element'
+
+
+# ==========================================
+# 4. 库位管理模型
+# ==========================================
+class SysWarehouseLocation(db.Model):
+    """
+    库位字典表（支持无限层级树形结构）
+    对应数据库: sys_warehouse_location
+    """
+    __tablename__ = 'sys_warehouse_location'
+
+    id = db.Column(db.Integer, primary_key=True)
+    parent_id = db.Column(db.Integer, db.ForeignKey('sys_warehouse_location.id'), nullable=True)
+    name = db.Column(db.String(100), nullable=False)
+    full_path = db.Column(db.String(500))  # 完整路径，如 "A区/货架1/第3层"
+    level = db.Column(db.Integer, default=0)  # 层级深度，顶级为0
+    is_enabled = db.Column(db.Boolean, default=True)
+    created_at = db.Column(db.DateTime, default=datetime.now)
+    updated_at = db.Column(db.DateTime, default=datetime.now, onupdate=datetime.now)
+
+    # 自关联
+    children = db.relationship('SysWarehouseLocation', backref=db.backref('parent', remote_side=[id]), lazy='dynamic')
+
+    def to_dict(self):
+        return {
+            'id': self.id,
+            'parent_id': self.parent_id,
+            'name': self.name,
+            'full_path': self.full_path,
+            'level': self.level,
+            'is_enabled': self.is_enabled,
+            'created_at': self.created_at.isoformat() if self.created_at else None,
+            'updated_at': self.updated_at.isoformat() if self.updated_at else None
+        }