chore: Refactor Dockerfile and build workflow for improved efficiency

- Removed the build stage from the Dockerfile, simplifying the image creation process.
- Updated the Dockerfile to directly copy the pre-built binary instead of using a multi-stage build.
- Modified the build workflow to eliminate unnecessary build arguments, streamlining the configuration.

Dockerfile

@@ -1,33 +1,8 @@
-# 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
+RUN apk add --no-cache ca-certificates tzdata wget
 
 # 创建非 root 用户
 RUN addgroup -g 1000 appuser && \
@@ -36,9 +11,9 @@ RUN addgroup -g 1000 appuser && \
 # 设置工作目录
 WORKDIR /app
 
-# 从构建阶段复制二进制文件
+# 复制已经编译好的二进制文件
 ARG BINARY_NAME=mcauth-linux-amd64
-COPY --from=builder /app/${BINARY_NAME} /app/server
+COPY ${BINARY_NAME} /app/server
 
 # 复制配置文件（如果需要）
 COPY configs/ /app/configs/