chore: initialize Gitea v1.27.2 fork

Includes direct password setup links in registration emails.

Assisted-by: Codex:GPT-5

services/auth/source.go

@@ -0,0 +1,42 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package auth
+
+import (
+	"context"
+
+	"gitea.dev/models/auth"
+	"gitea.dev/models/db"
+	user_model "gitea.dev/models/user"
+)
+
+// DeleteSource deletes a AuthSource record in DB.
+func DeleteSource(ctx context.Context, source *auth.Source) error {
+	count, err := db.GetEngine(ctx).Count(&user_model.User{LoginSource: source.ID})
+	if err != nil {
+		return err
+	} else if count > 0 {
+		return auth.ErrSourceInUse{
+			ID: source.ID,
+		}
+	}
+
+	count, err = db.GetEngine(ctx).Count(&user_model.ExternalLoginUser{LoginSourceID: source.ID})
+	if err != nil {
+		return err
+	} else if count > 0 {
+		return auth.ErrSourceInUse{
+			ID: source.ID,
+		}
+	}
+
+	if registerableSource, ok := source.Cfg.(auth.RegisterableSource); ok {
+		if err := registerableSource.UnregisterSource(); err != nil {
+			return err
+		}
+	}
+
+	_, err = db.GetEngine(ctx).ID(source.ID).Delete(new(auth.Source))
+	return err
+}