feat: 优化库位树UI层级颜色，并将入库页面库位输入升级为级联选择器

inventory-backend/app/api/v1/warehouse.py

@@ -0,0 +1,180 @@
+# inventory-backend/app/api/v1/warehouse.py
+from flask import Blueprint, request, jsonify
+from app.extensions import db
+from app.models.system import SysWarehouseLocation
+
+warehouse_bp = Blueprint('warehouse', __name__, url_prefix='/api/v1/warehouse')
+
+
+def build_tree(nodes, parent_id=None):
+    """
+    将平铺的数据构建为树形结构
+    """
+    tree = []
+    for node in nodes:
+        if node.parent_id == parent_id:
+            children = build_tree(nodes, node.id)
+            node_dict = node.to_dict()
+            if children:
+                node_dict['children'] = children
+            else:
+                node_dict['children'] = []
+            tree.append(node_dict)
+    return tree
+
+
+@warehouse_bp.route('/tree', methods=['GET'])
+def get_tree():
+    """
+    获取库位树形结构
+    """
+    try:
+        # 查询所有库位
+        all_locations = SysWarehouseLocation.query.order_by(SysWarehouseLocation.level, SysWarehouseLocation.id).all()
+        
+        # 构建树形结构
+        tree_data = build_tree(all_locations, parent_id=None)
+        
+        return jsonify({
+            'code': 200,
+            'msg': 'success',
+            'data': tree_data
+        })
+    except Exception as e:
+        return jsonify({
+            'code': 500,
+            'msg': str(e),
+            'data': None
+        }), 500
+
+
+@warehouse_bp.route('', methods=['POST'])
+def create_location():
+    """
+    创建库位
+    """
+    try:
+        data = request.get_json()
+        name = data.get('name', '').strip()
+        parent_id = data.get('parent_id')  # None 表示顶级
+        is_enabled = data.get('is_enabled', True)
+        
+        if not name:
+            return jsonify({'code': 400, 'msg': '库位名称不能为空', 'data': None})
+        
+        # 计算 level 和 full_path
+        if parent_id is None:
+            level = 0
+            full_path = name
+            parent_full_path = ''
+        else:
+            parent = SysWarehouseLocation.query.get(parent_id)
+            if not parent:
+                return jsonify({'code': 400, 'msg': '父级库位不存在', 'data': None})
+            level = parent.level + 1
+            parent_full_path = parent.full_path or ''
+            full_path = f"{parent_full_path}/{name}" if parent_full_path else name
+        
+        location = SysWarehouseLocation(
+            name=name,
+            parent_id=parent_id,
+            full_path=full_path,
+            level=level,
+            is_enabled=is_enabled
+        )
+        db.session.add(location)
+        db.session.commit()
+        
+        return jsonify({
+            'code': 200,
+            'msg': '创建成功',
+            'data': location.to_dict()
+        })
+    except Exception as e:
+        db.session.rollback()
+        return jsonify({
+            'code': 500,
+            'msg': str(e),
+            'data': None
+        }), 500
+
+
+@warehouse_bp.route('/<int:location_id>', methods=['PUT'])
+def update_location(location_id):
+    """
+    更新库位
+    """
+    try:
+        data = request.get_json()
+        location = SysWarehouseLocation.query.get(location_id)
+        
+        if not location:
+            return jsonify({'code': 404, 'msg': '库位不存在', 'data': None})
+        
+        # 更新名称
+        if 'name' in data and data['name']:
+            new_name = data['name'].strip()
+            if new_name != location.name:
+                # 需要更新 full_path
+                parent = location.parent
+                if parent:
+                    location.full_path = f"{parent.full_path}/{new_name}" if parent.full_path else new_name
+                else:
+                    location.full_path = new_name
+                location.name = new_name
+        
+        # 更新启用状态
+        if 'is_enabled' in data:
+            location.is_enabled = data['is_enabled']
+        
+        db.session.commit()
+        
+        return jsonify({
+            'code': 200,
+            'msg': '更新成功',
+            'data': location.to_dict()
+        })
+    except Exception as e:
+        db.session.rollback()
+        return jsonify({
+            'code': 500,
+            'msg': str(e),
+            'data': None
+        }), 500
+
+
+@warehouse_bp.route('/<int:location_id>', methods=['DELETE'])
+def delete_location(location_id):
+    """
+    删除库位（级联删除子库位）
+    """
+    try:
+        location = SysWarehouseLocation.query.get(location_id)
+        
+        if not location:
+            return jsonify({'code': 404, 'msg': '库位不存在', 'data': None})
+        
+        # 递归删除所有子库位
+        def delete_recursive(loc):
+            # 先删除所有子节点
+            children = SysWarehouseLocation.query.filter_by(parent_id=loc.id).all()
+            for child in children:
+                delete_recursive(child)
+            # 再删除自身
+            db.session.delete(loc)
+        
+        delete_recursive(location)
+        db.session.commit()
+        
+        return jsonify({
+            'code': 200,
+            'msg': '删除成功',
+            'data': None
+        })
+    except Exception as e:
+        db.session.rollback()
+        return jsonify({
+            'code': 500,
+            'msg': str(e),
+            'data': None
+        }), 500