fix: set CGO_CFLAGS for OpenCV 4 include path

Dockerfile

@@ -1,4 +1,4 @@
-# 构建阶段 - 使用 Debian 基础镜像，OpenCV 支持更好
+# 构建阶段 - 使用 Debian 基础镜像
 FROM golang:1.22-bookworm AS builder
 
 # 安装 OpenCV 和编译工具
@@ -14,9 +14,14 @@ WORKDIR /app
 # 复制源代码
 COPY . .
 
-# 构建 (启用 CGO)
+# 设置 CGO 编译标志 - OpenCV 4 头文件路径
+ENV CGO_ENABLED=1
+ENV CGO_CFLAGS="-I/usr/include/opencv4"
+ENV CGO_LDFLAGS="-lopencv_core -lopencv_imgproc -lopencv_imgcodecs"
+
+# 构建
 RUN go mod download || true
-RUN CGO_ENABLED=1 go build -ldflags="-s -w" -o anticaptcha ./cmd/server
+RUN go build -ldflags="-s -w" -o anticaptcha ./cmd/server
 
 # 运行阶段
 FROM debian:bookworm-slim
@@ -25,9 +30,9 @@ FROM debian:bookworm-slim
 RUN apt-get update && apt-get install -y --no-install-recommends \
     ca-certificates \
     tzdata \
-    libopencv-core-dev \
+    libopencv-core406 \
-    libopencv-imgproc-dev \
+    libopencv-imgproc406 \
-    libopencv-imgcodecs-dev \
+    libopencv-imgcodecs406 \
     libstdc++6 \
     && rm -rf /var/lib/apt/lists/*