fix: use Debian bookworm for better OpenCV support

Dockerfile

@@ -1,37 +1,35 @@
-# 构建阶段
-FROM golang:1.22-alpine AS builder
+# 构建阶段 - 使用 Debian 基础镜像，OpenCV 支持更好
+FROM golang:1.22-bookworm AS builder
 
 # 安装 OpenCV 和编译工具
-RUN apk add --no-cache \
+RUN apt-get update && apt-get install -y --no-install-recommends \
     gcc \
     g++ \
-    musl-dev \
-    opencv \
-    opencv-dev \
-    pkgconfig
+    libopencv-dev \
+    pkg-config \
+    && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
 
 # 复制源代码
 COPY . .
 
-# 设置 CGO 编译环境
-ENV CGO_ENABLED=1
-ENV PKG_CONFIG_PATH=/usr/lib/pkgconfig
-
-# 构建
+# 构建 (启用 CGO)
 RUN go mod download || true
-RUN go build -ldflags="-s -w" -o anticaptcha ./cmd/server
+RUN CGO_ENABLED=1 go build -ldflags="-s -w" -o anticaptcha ./cmd/server
 
 # 运行阶段
-FROM alpine:3.20
+FROM debian:bookworm-slim
 
 # 安装运行时依赖
-RUN apk add --no-cache \
+RUN apt-get update && apt-get install -y --no-install-recommends \
     ca-certificates \
     tzdata \
-    opencv \
-    libstdc++
+    libopencv-core-dev \
+    libopencv-imgproc-dev \
+    libopencv-imgcodecs-dev \
+    libstdc++6 \
+    && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
 
@@ -47,4 +45,4 @@ ENV TZ=Asia/Shanghai
 
 EXPOSE 6688
 
-CMD ["./anticaptcha"]
+CMD ["./anticaptcha"]