chore: initialize Gitea v1.27.2 fork

Includes direct password setup links in registration emails.

Assisted-by: Codex:GPT-5

services/migrations/http_client.go

@@ -0,0 +1,42 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package migrations
+
+import (
+	"crypto/tls"
+	"net/http"
+
+	"gitea.dev/modules/hostmatcher"
+	"gitea.dev/modules/proxy"
+	"gitea.dev/modules/setting"
+	"gitea.dev/modules/util"
+)
+
+// migrationHTTPClient is the shared migration client. Callers that would otherwise build a client per
+// request use it (via getMigrationHTTPClient) so a single connection pool is reused across downloads —
+// e.g. many release assets from the same host — instead of a fresh pool and TLS handshake each time. It
+// is built lazily on first use and reset by Init whenever the allow/block lists change; OnceValue keeps
+// concurrent callers sharing a single client instead of racing to create their own.
+var migrationHTTPClient = util.OnceValue[*http.Client]{Func: newMigrationHTTPClient}
+
+// newMigrationHTTPClient returns a HTTP client for migration
+func newMigrationHTTPClient() *http.Client {
+	return &http.Client{
+		Transport: NewMigrationHTTPTransport(),
+	}
+}
+
+// getMigrationHTTPClient returns the shared migration client, building it on first use so no request
+// escapes the SSRF-validated transport even before Init has run.
+func getMigrationHTTPClient() *http.Client {
+	return migrationHTTPClient.Value()
+}
+
+// NewMigrationHTTPTransport returns a HTTP transport for migration. The target is validated against the
+// allow/block lists on both the direct-dial and proxy paths, so a configured proxy cannot be used to
+// reach an otherwise-forbidden target (SSRF).
+func NewMigrationHTTPTransport() *http.Transport {
+	return hostmatcher.NewHTTPTransport("migration", allowList, blockList, proxy.Proxy(), setting.Proxy.ProxyURLFixed,
+		&tls.Config{InsecureSkipVerify: setting.Migrations.SkipTLSVerify})
+}