fix: add PKG_CONFIG_PATH and remove unused import

Dockerfile

@@ -15,9 +15,13 @@ WORKDIR /app
 # 复制源代码
 COPY . .
 
-# 构建 (启用 CGO)
+# 设置 CGO 编译环境
+ENV CGO_ENABLED=1
+ENV PKG_CONFIG_PATH=/usr/lib/pkgconfig
+
+# 构建
 RUN go mod download || true
-RUN CGO_ENABLED=1 GOOS=linux go build -ldflags="-s -w" -o anticaptcha ./cmd/server
+RUN go build -ldflags="-s -w" -o anticaptcha ./cmd/server
 
 # 运行阶段
 FROM alpine:3.20

internal/database/database.go

@@ -2,7 +2,6 @@ package database
 
 import (
 	"fmt"
-	"log"
 
 	"anticaptcha/internal/config"
 	"anticaptcha/internal/model"