chore: initialize Gitea v1.27.2 fork

Includes direct password setup links in registration emails.

Assisted-by: Codex:GPT-5

models/gituser/avatar_stack.go

@@ -0,0 +1,52 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package gituser
+
+import (
+	"context"
+
+	"gitea.dev/models/user"
+	"gitea.dev/modules/container"
+	"gitea.dev/modules/git"
+	"gitea.dev/modules/log"
+)
+
+// AvatarStackData is the view-model for the AvatarStack render helpers. Participants[0] is
+// the primary participant (commit author), painted on top; the rest follow.
+type AvatarStackData struct {
+	Participants      []*CommitParticipant
+	SearchByEmailLink string
+}
+
+func BuildAvatarStackData(ctx context.Context, allParticipants []*git.CommitIdentity, emailUserMap *user.EmailUserMap) *AvatarStackData {
+	if emailUserMap == nil {
+		emails := make([]string, len(allParticipants))
+		for i, sig := range allParticipants {
+			emails[i] = sig.Email
+		}
+		var err error
+		emailUserMap, err = user.GetUsersByEmails(ctx, emails)
+		if err != nil {
+			log.Error("GetUsersByEmails failed: %v", err)
+		}
+	}
+	ret := &AvatarStackData{
+		Participants: make([]*CommitParticipant, 0, len(allParticipants)),
+	}
+	uniqueUserIDs := make(container.Set[int64])
+	for _, p := range allParticipants {
+		var giteaUser *user.User
+		if emailUserMap != nil {
+			giteaUser = emailUserMap.GetByEmail(p.Email)
+		}
+		if giteaUser != nil {
+			// identities without a Gitea account can only be compared by their git identity
+			if !uniqueUserIDs.Add(giteaUser.ID) {
+				continue
+			}
+		}
+		ret.Participants = append(ret.Participants, &CommitParticipant{GiteaUser: giteaUser, GitIdentity: p})
+	}
+	return ret
+}