fix(deploy): remove self-copy of nginx conf; show migration key input

- cp nginx conf to itself caused error; file is already in place
- migration key prompt changed from silent to visible (read -rp)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/deploy.sh

@@ -166,7 +166,7 @@ else
 
   _MIGRATE_KEY=""
   while [ -z "$_MIGRATE_KEY" ]; do
-    read -rsp "  请粘贴迁移密钥: " _MIGRATE_KEY; printf '\n'
+    read -rp "  请粘贴迁移密钥: " _MIGRATE_KEY
     [[ "$_MIGRATE_KEY" == pmk_* ]] || {
       warn "密钥格式不正确（应以 pmk_ 开头），请重新输入"
       _MIGRATE_KEY=""
@@ -475,8 +475,7 @@ server {
 }
 NGINX_CONF
 # 实际使用仓库中的文件（已跳过上方 heredoc）
-cp "$NGINX_SRC" "$ROOT_DIR/config/nginx/conf.d/xuqm.conf"
-ok "config/nginx/conf.d/xuqm.conf 已写入（来自 $NGINX_SRC）"
+ok "config/nginx/conf.d/xuqm.conf 就绪（使用仓库内文件）"
 
 # config/vendors/push.env — 推送服务厂商凭据（初始为关闭状态，按需开启）
 mkdir -p "$ROOT_DIR/config/vendors"