feat(webhook): support Telegram Bot API 10.1 Rich Messages (#38298)

Upgrades Gitea's Telegram webhook integration to support Telegram Bot
API 10.1 (June 2026 release). This enables Gitea webhooks to take
advantage of rich formatted messages (tables, nested blocks, collapsible
details, etc.) by routing them through the /sendRichMessage endpoint
with the new rich_message payload structure.

Old `/sendMessage` webhook URLs are written to `/sendRichMessage`
at runtime to prevent the need for database migrations

Fixes https://github.com/go-gitea/gitea/issues/38118

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

services/webhook/telegram.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"html"
 	"net/http"
+	"net/url"
 	"strings"
 
 	webhook_model "gitea.dev/models/webhook"
@@ -23,9 +24,12 @@ import (
 type (
 	// TelegramPayload represents
 	TelegramPayload struct {
-		Message           string `json:"text"`
-		ParseMode         string `json:"parse_mode"`
-		DisableWebPreview bool   `json:"disable_web_page_preview"`
+		RichMessage InputRichMessage `json:"rich_message"`
+	}
+
+	// InputRichMessage represents input rich message
+	InputRichMessage struct {
+		HTML string `json:"html"`
 	}
 
 	// TelegramMeta contains the telegram metadata
@@ -195,13 +199,21 @@ func (telegramConvertor) WorkflowJob(p *api.WorkflowJobPayload) (TelegramPayload
 func createTelegramPayloadHTML(msgHTML string) TelegramPayload {
 	// https://core.telegram.org/bots/api#formatting-options
 	return TelegramPayload{
-		Message:           strings.TrimSpace(string(markup.Sanitize(msgHTML))),
-		ParseMode:         "HTML",
-		DisableWebPreview: true,
+		RichMessage: InputRichMessage{
+			HTML: strings.TrimSpace(string(markup.Sanitize(msgHTML))),
+		},
 	}
 }
 
 func newTelegramRequest(_ context.Context, w *webhook_model.Webhook, t *webhook_model.HookTask) (*http.Request, []byte, error) {
+	u, err := url.Parse(w.URL)
+	if err != nil {
+		return nil, nil, err
+	}
+	if urlPrefix, ok := strings.CutSuffix(u.Path, "/sendMessage"); ok {
+		u.Path = urlPrefix + "/sendRichMessage"
+		w.URL = u.String()
+	}
 	var pc payloadConvertor[TelegramPayload] = telegramConvertor{}
 	return newJSONRequest(pc, w, t, true)
 }