feat: 初始化 Gateway 仓库

Dockerfile

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+FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
+WORKDIR /src
+
+# 1. 先只复制 csproj 文件 (利用 Docker 缓存)
+COPY ["src/Gateway/TakeoutSaaS.ApiGateway/TakeoutSaaS.ApiGateway.csproj", "src/Gateway/TakeoutSaaS.ApiGateway/"]
+
+# 2. 还原依赖 (如果 csproj 没变，这一步会直接使用缓存，瞬间完成)
+RUN dotnet restore "src/Gateway/TakeoutSaaS.ApiGateway/TakeoutSaaS.ApiGateway.csproj"
+
+# 3. 再复制剩余的所有源代码
+COPY . .
+
+# 4. 发布
+RUN dotnet publish "src/Gateway/TakeoutSaaS.ApiGateway/TakeoutSaaS.ApiGateway.csproj" -c Release -o /app/publish
+
+# --- 运行时环境 ---
+FROM mcr.microsoft.com/dotnet/aspnet:10.0
+WORKDIR /app
+COPY --from=build /app/publish .
+
+# 显式声明端口
+EXPOSE 5000
+ENV ASPNETCORE_URLS=http://+:5000
+
+ENTRYPOINT ["dotnet", "TakeoutSaaS.ApiGateway.dll"]