diff --git a/REFACTOR_PLAN.md b/REFACTOR_PLAN.md
index 81f4dfe..fb02b6b 100644
--- a/REFACTOR_PLAN.md
+++ b/REFACTOR_PLAN.md
@@ -292,3 +292,11 @@ src/
   - `composables/toast.ts`：模块级响应式 `toasts` 列表，`setToast(message, type?, duration?)` 推入带唯一 id 的条目并定时自动移除（默认 3s）；`useToast()` 签名不变，13 个调用视图零改动；移除原 provide/inject 方案。
   - `Toast.vue`：daisyUI `toast toast-top toast-end` 容器 + `TransitionGroup` 进出场动画（仅 transform/opacity，配合全局 reduced-motion 降级）、每条带关闭按钮（aria-label）、容器 `aria-live="polite"`。
 - 验证：`pnpm build` 通过；浏览器实测连续触发两条 toast 同时堆叠展示、3s 后全部自动消失。
+
+### 增量 8 — dev 镜像构建脚本（多平台）✅
+
+- 新增 `deploy/docker/build-dev.sh` + `make image-dev`：
+  - 默认多平台 `linux/amd64,linux/arm64` 构建并推送（自动创建缺失的 buildx 容器构建器）；`PUSH=0` 退化为本机架构构建并 `--load` 到本地。
+  - 标签：`dev`、`dev-<短SHA>`、`dev-<YYYYMMDD>`（`REGISTRY_IMAGE` / `PLATFORMS` / `BUILDER` / `DOCKERFILE` 均可用环境变量覆盖）。
+  - 推送时附带 registry inline cache（`--cache-from/--cache-to type=inline`）加速后续 dev 构建。
+- 验证：`PUSH=0` 端到端实测通过（容器内前端构建 + Go 交叉编译 + upx 压缩 31.7MB→11.8MB + 本地加载）；镜像冒烟测试 `/:200`、`/api/*:200`。
diff --git a/deploy/docker/build-dev.sh b/deploy/docker/build-dev.sh
new file mode 100755
index 0000000..2f65b26
--- /dev/null
+++ b/deploy/docker/build-dev.sh
@@ -0,0 +1,48 @@
+#!/usr/bin/env sh
+# 构建 dev 镜像：默认多平台(amd64/arm64)并推送，PUSH=0 时按本机架构构建并加载到本地
+#
+# 用法：
+#   sh deploy/docker/build-dev.sh                 # 多平台构建并推送 dev 标签
+#   PUSH=0 sh deploy/docker/build-dev.sh          # 本机架构构建 --load，仅本地
+#   REGISTRY_IMAGE=demo/openteam PLATFORMS=linux/amd64 sh deploy/docker/build-dev.sh
+set -e
+
+cd "$(dirname "$0")/../.."
+
+REGISTRY_IMAGE=${REGISTRY_IMAGE:-mirrors2/opencatd-open}
+PLATFORMS=${PLATFORMS:-linux/amd64,linux/arm64}
+BUILDER=${BUILDER:-xbuilder}
+PUSH=${PUSH:-1}
+DOCKERFILE=${DOCKERFILE:-deploy/docker/Dockerfile}
+
+SHORT_SHA=$(git rev-parse --short HEAD 2>/dev/null || echo unknown)
+DATE_TAG=$(date +%Y%m%d)
+
+# 确保 buildx 容器构建器存在（默认 docker driver 不支持多平台）
+docker buildx inspect "$BUILDER" >/dev/null 2>&1 || docker buildx create --name "$BUILDER" --driver docker-container >/dev/null
+
+TAGS="-t $REGISTRY_IMAGE:dev -t $REGISTRY_IMAGE:dev-$SHORT_SHA -t $REGISTRY_IMAGE:dev-$DATE_TAG"
+
+if [ "$PUSH" = "1" ]; then
+  echo ">>> 多平台构建并推送: $PLATFORMS"
+  # shellcheck disable=SC2086
+  docker buildx build \
+    --builder "$BUILDER" \
+    --platform "$PLATFORMS" \
+    $TAGS \
+    --cache-from type=registry,ref="$REGISTRY_IMAGE:dev" \
+    --cache-to type=inline \
+    -f "$DOCKERFILE" \
+    . --push
+  echo ">>> 已推送: $REGISTRY_IMAGE:dev (dev-$SHORT_SHA, dev-$DATE_TAG)"
+else
+  HOST_ARCH=$(docker version -f '{{.Server.Arch}}')
+  echo ">>> 本机架构构建并加载: linux/$HOST_ARCH"
+  docker buildx build \
+    --builder "$BUILDER" \
+    --platform "linux/$HOST_ARCH" \
+    $TAGS \
+    -f "$DOCKERFILE" \
+    . --load
+  echo ">>> 已加载本地镜像: $REGISTRY_IMAGE:dev (dev-$SHORT_SHA, dev-$DATE_TAG)"
+fi
diff --git a/makefile b/makefile
index 156c9c4..a0e0841 100644
--- a/makefile
+++ b/makefile
@@ -60,6 +60,11 @@ docker:
 	docker buildx inspect xbuilder --bootstrap
 	docker buildx build --platform linux/amd64,linux/arm64 -t mirrors2/opencatd-open:latest -f deploy/docker/Dockerfile . --push
 
+.PHONY:image-dev
+# build & push multi-arch dev image (PUSH=0 仅本地加载本机架构)
+image-dev:
+	sh deploy/docker/build-dev.sh
+
 .PHONY: clean
 # clean
 clean: