chore: initialize Gitea v1.27.2 fork

Includes direct password setup links in registration emails.

Assisted-by: Codex:GPT-5

snap/part-gitea-build.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+set -e
+
+if [ ! -f go.mod ] || [ ! -d snap ]; then
+  echo "This script should be run from the root of the gitea repository"
+  exit 1
+fi
+
+if [ -z "$SNAPCRAFT_PART_INSTALL" ]; then
+  SNAPCRAFT_PART_INSTALL="./dist/snap"
+  echo "* using mock install path: $SNAPCRAFT_PART_INSTALL"
+fi
+
+command -v pnpm >/dev/null 2>&1 || npm install -g pnpm
+
+# build tags for 1.26: "bindata sqlite sqlite_unlock_notify pam cert"
+# for 1.27: sqlite is not needed, "cert" seems doing nothing
+TAGS="bindata pam" make build
+
+install -D gitea "${SNAPCRAFT_PART_INSTALL}/gitea"
+cp -r options "${SNAPCRAFT_PART_INSTALL}/"