权限管理，没有页面修改之前版本

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

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+# inventory-backend/app/api/v1/permission.py
+from flask import Blueprint, request, jsonify, current_app
+from flask_jwt_extended import jwt_required
+from app.services.permission_service import PermissionService
+
+permission_bp = Blueprint('permission', __name__)
+
+
+@permission_bp.route('/tree', methods=['GET'])
+@jwt_required()
+def get_tree():
+    """获取权限树"""
+    try:
+        data = PermissionService.get_permission_tree()
+        return jsonify({'code': 200, 'msg': '获取成功', 'data': data}), 200
+    except Exception as e:
+        # 打印详细错误到控制台，方便调试
+        current_app.logger.error(f"Get Tree Failed: {str(e)}")
+        # 返回 500 时带上错误信息
+        return jsonify({'code': 500, 'msg': f'服务器内部错误: {str(e)}'}), 500
+
+
+@permission_bp.route('/role/<string:role_code>', methods=['GET'])
+@jwt_required()
+def get_role_perms(role_code):
+    """获取某个角色的权限列表"""
+    try:
+        data = PermissionService.get_role_permissions(role_code)
+        return jsonify({'code': 200, 'msg': '获取成功', 'data': data}), 200
+    except Exception as e:
+        current_app.logger.error(f"Get Role Perms Failed: {str(e)}")
+        return jsonify({'code': 500, 'msg': str(e)}), 500
+
+
+@permission_bp.route('/assign', methods=['POST'])
+@jwt_required()
+def assign_perms():
+    """保存权限分配"""
+    try:
+        data = request.get_json()
+        role_code = data.get('role_code')
+        permissions = data.get('permissions', [])  # list of codes
+
+        PermissionService.assign_permissions(role_code, permissions)
+        return jsonify({'code': 200, 'msg': '保存成功'}), 200
+    except Exception as e:
+        current_app.logger.error(f"Assign Perms Failed: {str(e)}")
+        return jsonify({'code': 500, 'msg': str(e)}), 500