Add webhook name field to improve webhook identification (#37025) (#37040)

Add an optional Name field to webhooks so users can give them
human-readable labels instead of relying only on URLs. The webhook
overview page now displays names when available, or falls back to the
URL for unnamed webhooks.

Fixes #37025

---------

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

models/migrations/v1_26/v330.go

@@ -0,0 +1,16 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_26
+
+import (
+	"xorm.io/xorm"
+)
+
+func AddNameToWebhook(x *xorm.Engine) error {
+	type Webhook struct {
+		Name string `xorm:"VARCHAR(255) NOT NULL DEFAULT ''"`
+	}
+	_, err := x.SyncWithOptions(xorm.SyncOptions{IgnoreDropIndices: true}, new(Webhook))
+	return err
+}