Feat/qq local file upload (#1722)

* feat(qq): support media uploads and inbound attachments

* docs(qq): document media size limit settings

* chore(web): add QQ media size limit hints

* fix(qq): demote botgo heartbeat logs

* style(qq): fix lint issues

web/frontend/src/components/channels/channel-forms/generic-form.tsx

@@ -138,6 +138,7 @@ export function GenericForm({
       real_name: t("channels.form.desc.realName"),
       channels: t("channels.form.desc.channels"),
       request_caps: t("channels.form.desc.requestCaps"),
+      max_base64_file_size_mib: t("channels.form.desc.maxBase64FileSizeMiB"),
     }
     return (
       descriptions[key] ??