chore: initialize Gitea v1.27.2 fork

Includes direct password setup links in registration emails.

Assisted-by: Codex:GPT-5

modules/json/jsonlegacy.go

@@ -0,0 +1,25 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build !goexperiment.jsonv2
+
+package json
+
+import (
+	"encoding/json" //nolint:depguard // this package wraps it
+	"io"
+)
+
+func getDefaultJSONHandler() Interface {
+	return jsonV1{}
+}
+
+func MarshalKeepOptionalEmpty(v any) ([]byte, error) {
+	return DefaultJSONHandler.Marshal(v)
+}
+
+func NewDecoderCaseInsensitive(reader io.Reader) Decoder {
+	return DefaultJSONHandler.NewDecoder(reader)
+}
+
+type Value = json.RawMessage