build: 配置 docker

backend/Dockerfile

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+# ---- Build Stage ----
+FROM golang:1.26-alpine AS builder
+
+WORKDIR /src
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -o /bin/gen2d ./cmd/main.go
+
+# ---- Runtime Stage ----
+FROM alpine:3.20
+
+RUN apk add --no-cache ca-certificates
+COPY --from=builder /bin/gen2d /usr/local/bin/gen2d
+
+EXPOSE 8080
+CMD ["gen2d"]