refactor: Streamline user information retrieval and validation

- Refactored the user information retrieval process to improve efficiency.
- Enhanced validation logic for input parameters in the user handler.
- Updated UserService interface to support new retrieval methods.
- Improved error handling for user status checks before responding.

Dockerfile

@@ -0,0 +1,60 @@
+# 构建阶段
+FROM golang:1.25-alpine AS builder
+
+# 安装必要的工具
+RUN apk add --no-cache git ca-certificates tzdata
+
+# 设置工作目录
+WORKDIR /build
+
+# 复制 go mod 文件
+COPY go.mod go.sum ./
+
+# 下载依赖
+RUN go mod download
+
+# 复制源代码
+COPY . .
+
+# 构建应用
+ARG BINARY_NAME=mcauth-linux-amd64
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
+    -ldflags="-w -s" \
+    -o /app/${BINARY_NAME} \
+    ./cmd/server
+
+# 运行阶段
+FROM alpine:latest
+
+# 安装必要的运行时依赖
+RUN apk add --no-cache ca-certificates tzdata
+
+# 创建非 root 用户
+RUN addgroup -g 1000 appuser && \
+    adduser -D -u 1000 -G appuser appuser
+
+# 设置工作目录
+WORKDIR /app
+
+# 从构建阶段复制二进制文件
+ARG BINARY_NAME=mcauth-linux-amd64
+COPY --from=builder /app/${BINARY_NAME} /app/server
+
+# 复制配置文件（如果需要）
+COPY configs/ /app/configs/
+
+# 设置权限
+RUN chown -R appuser:appuser /app
+
+# 切换到非 root 用户
+USER appuser
+
+# 暴露端口
+EXPOSE 8080
+
+# 健康检查
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+    CMD wget --no-verbose --tries=1 --spider http://localhost:8080/health || exit 1
+
+# 启动应用
+ENTRYPOINT ["/app/server"]