feat: 更新Docker构建配置，支持多架构构建，修改Dockerfile以适应不同目标架构

.github/workflows/docker-publish.yml

@@ -1,5 +1,5 @@
 
-name: 🐳 Build and Push Docker Image (AMD64)
+name: 🐳 Build and Push Docker Image (Multi-Arch)
 
 on:
   # 手动触发
@@ -57,6 +57,11 @@ jobs:
             type=raw,value=latest,enable={{is_default_branch}}
             type=raw,value=${{ inputs.version }},enable=${{ github.event_name == 'workflow_dispatch' }}
 
+      - name: 🔧 Set up QEMU
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: arm64
+
       - name: 🔧 Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
         with:
@@ -76,9 +81,10 @@ jobs:
       - name: 🏗️ Set build platform
         id: platforms
         run: |
-          echo "platforms=linux/amd64" >> $GITHUB_OUTPUT
+          echo "platforms=linux/amd64,linux/arm64" >> $GITHUB_OUTPUT
 
       - name: 🐳 Build and push Docker image
+        id: build
         uses: docker/build-push-action@v5
         with:
           context: .

Dockerfile

@@ -1,5 +1,5 @@
 # ==============================================
-# AMD64 Dockerfile - 基于 build-fullstack.sh 流程
+# Multi-Arch Dockerfile - 基于 build-fullstack.sh 流程
 # ==============================================
 
 # 前端构建阶段
@@ -35,8 +35,11 @@ RUN apk add --no-cache git ca-certificates tzdata
 
 ENV GOPROXY=https://proxy.golang.org,direct
 ENV CGO_ENABLED=0
-ENV GOOS=linux
-ENV GOARCH=amd64
+
+ARG TARGETOS
+ARG TARGETARCH
+ENV GOOS=${TARGETOS}
+ENV GOARCH=${TARGETARCH}
 
 WORKDIR /app
 
@@ -50,7 +53,7 @@ RUN go mod download
 # 拷贝前端构建结果
 COPY --from=frontend-builder /app/chuan-next/out ./internal/web/frontend/
 
-# 构建 Go 应用 - AMD64 架构（模拟 build-fullstack.sh 的 build_backend 函数）
+# 构建 Go 应用 - 按目标架构编译（模拟 build-fullstack.sh 的 build_backend 函数）
 RUN go build -ldflags='-s -w -extldflags '-static'' -o server ./cmd
 
 # ==============================================