chore: configure Gitea repository source

tests/install_test.sh

@@ -126,6 +126,24 @@ test_compose_configuration() {
   grep -Fq './certs:/certs:ro' "${ROOT_DIR}/deploy/docker-compose.yml" || fail_test "certificate mount missing"
 }
 
+test_source_url_persistence() (
+  local temp_dir
+  temp_dir="$(mktemp -d)"
+  INSTALL_DIR="${temp_dir}/install"
+  SOURCE_URL_FILE="${INSTALL_DIR}/.source-url"
+  CLI_PATH="${temp_dir}/newszxcn-email"
+  RAW_BASE="https://gitea.example.test/szx/NewSzxcn-Email/raw/branch/main"
+  mkdir -p "${INSTALL_DIR}"
+  printf 'services: {}\n' > "${INSTALL_DIR}/.docker-compose.yml.new"
+  printf 'LANQIN_IMAGE=test\n' > "${INSTALL_DIR}/.env.example.new"
+  printf '#!/usr/bin/env bash\nexit 0\n' > "${INSTALL_DIR}/.install.sh.new"
+
+  apply_staged_assets
+
+  assert_eq "${RAW_BASE}" "$(cat "${SOURCE_URL_FILE}")" "persisted installer source URL"
+  [[ -x "${CLI_PATH}" ]] || fail_test "installed CLI is not executable"
+)
+
 test_legacy_configuration_is_preserved() {
   local temp_dir
   temp_dir="$(mktemp -d)"
@@ -835,6 +853,7 @@ test_install_configuration 1 1 "127.0.0.1:8088" "https://mail.example.com" "fals
 test_install_configuration 2 2 "127.0.0.1:8088" "https://mail.example.com" "false"
 test_nginx_configuration
 test_compose_configuration
+test_source_url_persistence
 test_legacy_configuration_is_preserved
 test_menu_choice
 test_menu_rendering