docs: add webhook preset templates and Telegram push docs (#884)

docs: add webhook preset templates and Telegram per-user push docs (#769)

Add Telegram Bot, WeChat Work, Discord webhook preset templates to
frontend and documentation. Add per-user mail push and global push
documentation for Telegram Bot.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

vitepress-docs/docs/en/guide/feature/webhook.md

@@ -26,6 +26,77 @@ This project uses [songquanpeng/message-pusher](https://github.com/songquanpeng/
 
 ![telegram](/feature/address-webhook.png)
 
+## Webhook Template Examples
+
+### Telegram Bot Push
+
+Push email notifications by calling the Telegram Bot API directly via webhook. Suitable for scenarios where you don't want to deploy the full Telegram Bot integration or need a custom push format.
+
+- **URL**: `https://api.telegram.org/bot<YOUR_BOT_TOKEN>/sendMessage`
+- **Method**: `POST`
+- **Headers**:
+
+```json
+{
+    "Content-Type": "application/json"
+}
+```
+
+- **Body**:
+
+```json
+{
+    "chat_id": "YOUR_CHAT_ID",
+    "text": "New Email\nFrom: ${from}\nTo: ${to}\nSubject: ${subject}\nURL: ${url}"
+}
+```
+
+> [!TIP]
+> To get your `chat_id`: send a message to the Bot, then visit `https://api.telegram.org/bot<YOUR_BOT_TOKEN>/getUpdates` and look for the `chat.id` field in the response
+
+### WeChat Work Bot Push
+
+- **URL**: `https://qyapi.weixin.qq.com/cgi-bin/webhook/send?key=YOUR_KEY`
+- **Method**: `POST`
+- **Headers**:
+
+```json
+{
+    "Content-Type": "application/json"
+}
+```
+
+- **Body**:
+
+```json
+{
+    "msgtype": "text",
+    "text": {
+        "content": "New Email\nFrom: ${from}\nTo: ${to}\nSubject: ${subject}\nURL: ${url}"
+    }
+}
+```
+
+### Discord Webhook Push
+
+- **URL**: `https://discord.com/api/webhooks/YOUR_WEBHOOK_ID/YOUR_WEBHOOK_TOKEN`
+- **Method**: `POST`
+- **Headers**:
+
+```json
+{
+    "Content-Type": "application/json"
+}
+```
+
+- **Body**:
+
+```json
+{
+    "content": "**New Email**\nFrom: ${from}\nTo: ${to}\nSubject: ${subject}\nURL: ${url}"
+}
+```
+
 ## Webhook Data Format
 
 To get the url, you need to configure the worker's `FRONTEND_URL` to your frontend address, or you can construct the url yourself using `id` = `${FRONTEND_URL}?mail_id=${id}`