docs: document template storage limits

README.en.md

@@ -122,7 +122,7 @@ Telegram only accepts ports 443/80/88/8443.
 | `/set_forward_channel <channel>` | Set the forward channel: `@channel` or channel ID; media messages are forwarded to it automatically afterwards |
 | `/remove_forward_channel` | Remove the forward channel |
 | `/edit_before_forward` | Toggle "edit before forward": when enabled, the bot posts a prompt after forwarding; replying to it edits the first forwarded message's caption (or tapping a template button applies one), then `↩️ Confirm` forwards and `🛑 Skip` drops this forward; the prompt states its expiry and is marked expired in place when it lapses (nothing is forwarded) |
-| `/set_template <name>` | Reply to a message containing `[]` to save it as a named template; `[]` is replaced by the original post link when forwarding (used with "edit before forward") |
+| `/set_template <name>` | Reply to a message containing `[]` to save it as a named template; `[]` is replaced by the original post link when forwarding (used with "edit before forward"). Names are limited to 55 UTF-8 bytes, bodies to 1024 escaped characters, and 50 templates per chat |
 | `/remove_template <name>` | Remove a template (names are listed by `/settings`; the prompt's keyboard shows at most 60) |
 | `/settings` | Show this chat's configuration: forward channel, edit-before-forward, per-site caption formats, saved templates |
 | `/set_format <site> <format>` | Customize the caption format for one site. Sites: `twitter` / `bsky` / `pixiv` / `misskey` / `bilibili`. Placeholders: `{url}` `{author}` `{author_url}` `{title}` `{content}` `{tags}`; unknown placeholders are rejected with the list of valid ones, and `-` restores the site's built-in format (preview with `/debug <link>`) |

README.md

@@ -122,7 +122,7 @@ Telegram 只接受 443/80/88/8443 端口。
 | `/set_forward_channel <频道>` | 设置转发频道，参数为 `@频道名` 或频道 ID；设置后发送的媒体消息会自动转发到该频道 |
 | `/remove_forward_channel` | 取消转发频道 |
 | `/edit_before_forward` | 开关「转发前编辑」：开启后，转发成功后 bot 会发一条提示消息，回复它可修改第一条转发消息的 caption（或点击模板按钮套用模板），再点 `↩️ Confirm` 才会真正转发，`🛑 Skip` 放弃本次转发；提示消息写明过期时间，过期后原地标记为已过期且不会转发 |
-| `/set_template <名称>` | 回复一条含 `[]` 的消息，将其保存为命名模板；转发时 `[]` 会被替换为原帖链接（配合「转发前编辑」使用） |
+| `/set_template <名称>` | 回复一条含 `[]` 的消息，将其保存为命名模板；转发时 `[]` 会被替换为原帖链接（配合「转发前编辑」使用）。模板名称最长 55 个 UTF-8 字节、正文最长 1024 个转义后字符，每聊天最多 50 个模板 |
 | `/remove_template <名称>` | 删除某个模板（名称见 `/settings`；提示消息的模板按钮最多显示 60 个） |
 | `/settings` | 查看本聊天配置：转发频道、转发前编辑开关、各站点 caption 格式、模板列表 |
 | `/set_format <站点> <格式>` | 自定义某站点的 caption 格式。站点：`twitter` / `bsky` / `pixiv` / `misskey` / `bilibili`。占位符：`{url}` `{author}` `{author_url}` `{title}` `{content}` `{tags}`；未识别的占位符会被拒绝并列出可用项，格式填 `-` 恢复站点默认格式（可用 `/debug <链接>` 预览效果） |