修复错误

Dockerfile.backend

@@ -2,26 +2,26 @@ FROM golang:1.26-alpine AS builder
 
 WORKDIR /app
 
-# Copy Go files
+# 复制 Go 依赖文件 / Copy Go dependency files
 COPY backend/go.mod backend/go.sum ./
 RUN go mod download
 
 COPY backend ./backend
 WORKDIR /app/backend
 
-# Build the Go binary
+# 构建 Go 二进制文件 / Build Go binary
 RUN CGO_ENABLED=0 GOOS=linux go build -o /server ./cmd/server
 
-# Final stage
+# 最终运行镜像 / Runtime image
 FROM alpine:latest
 
-RUN apk --no-cache add ca-certificates tzdata
+RUN apk --no-cache add ca-certificates tzdata curl
 
 WORKDIR /app
 
 COPY --from=builder /server ./server
-# Expose port
+# 暴露服务端口 / Expose service port
 EXPOSE 8080
 
-# Run the server
-CMD ["./server"]
+# 启动服务 / Run server
+CMD ["./server"]