chore: migration for wxoa loading message

pkg/core/migrations/m036_wxoa_loading_message.py

@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+from .. import migration
+
+
+@migration.migration_class("wxoa-loading-message", 36)
+class WxoaLoadingMessageMigration(migration.Migration):
+    """迁移"""
+
+    async def need_migrate(self) -> bool:
+        """判断当前环境是否需要运行此迁移"""
+
+        for adapter in self.ap.platform_cfg.data['platform-adapters']:
+            if adapter['adapter'] == 'officialaccount':
+                if 'LoadingMessage' not in adapter:
+                    return True
+        return False
+
+    async def run(self):
+        """执行迁移"""
+        for adapter in self.ap.platform_cfg.data['platform-adapters']:
+            if adapter['adapter'] == 'officialaccount':
+                if 'LoadingMessage' not in adapter:
+                    adapter['LoadingMessage'] = 'AI正在思考中，请发送任意内容获取回复。'
+
+        await self.ap.platform_cfg.dump_config()