chore: initial public snapshot for github upload

llm-gateway-competitors/sub2api-tar/backend/Dockerfile

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+FROM golang:1.25.7-alpine
+
+WORKDIR /app
+
+# 安装必要的工具
+RUN apk add --no-cache git
+
+# 复制go.mod和go.sum
+COPY go.mod go.sum ./
+
+# 下载依赖
+RUN go mod download
+
+# 复制源代码
+COPY . .
+
+# 构建应用
+RUN go build -o main ./cmd/server/
+
+# 暴露端口
+EXPOSE 8080
+
+# 运行应用
+CMD ["./main"]