fix: qq_official_webhook is_sandbox field error (#3167)

* QQ官方机器人增加沙箱模式选项,让本地部署能跳过IP白名单验证

* chore: ruff format

* 修复沙盒配置为字符串判断

* 由于配置类型为字符串，修复为字符串判断

* chore: ruff format

* fix: update is_sandbox configuration to use boolean type

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Co-authored-by: 郭鹏 <gp@pp052.top>
Co-authored-by: Soulter <905617992@qq.com>
Co-authored-by: Dt8333 <lb0016@foxmail.com>

astrbot/core/config/default.py

@@ -324,6 +324,10 @@ CONFIG_METADATA_2 = {
                     #     "type": "string",
                     #     "options": ["fullscreen", "embedded"],
                     # },
+                    "is_sandbox": {
+                        "description": "沙箱模式",
+                        "type": "bool",
+                    },
                     "satori_api_base_url": {
                         "description": "Satori API 终结点",
                         "type": "string",