重构进行中，preview通道尚未完全恢复全部功能

internal/frp/binary.go

@@ -0,0 +1,85 @@
+package frp
+
+import (
+	"embed"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"sync"
+)
+
+//go:embed bin/*
+var embeddedFrpc embed.FS
+
+var (
+	cachedFrpcPath string
+	frpcPathMutex  sync.Mutex
+)
+
+// GetFrpcPath 获取 frpc 二进制路径
+// 优先级: 本地缓存 > 内嵌二进制 > 系统 PATH
+func GetFrpcPath() (string, error) {
+	frpcPathMutex.Lock()
+	defer frpcPathMutex.Unlock()
+
+	if cachedFrpcPath != "" {
+		if _, err := os.Stat(cachedFrpcPath); err == nil {
+			return cachedFrpcPath, nil
+		}
+		cachedFrpcPath = ""
+	}
+
+	var fileName string
+	switch {
+	case runtime.GOOS == "windows" && runtime.GOARCH == "amd64":
+		fileName = "frpc_windows_amd64.exe"
+	case runtime.GOOS == "linux" && runtime.GOARCH == "amd64":
+		fileName = "frpc_linux_amd64"
+	case runtime.GOOS == "linux" && runtime.GOARCH == "arm64":
+		fileName = "frpc_linux_arm64"
+	case runtime.GOOS == "linux" && runtime.GOARCH == "arm":
+		fileName = "frpc_linux_arm_hf"
+	default:
+		path, err := exec.LookPath("frpc")
+		if err == nil {
+			cachedFrpcPath = path
+			return path, nil
+		}
+		return "", fmt.Errorf("不支持的平台: %s/%s", runtime.GOOS, runtime.GOARCH)
+	}
+
+	// 尝试从本地 bin 目录加载
+	localPath := filepath.Join(".", "bin", fileName)
+	if _, err := os.Stat(localPath); err == nil {
+		cachedFrpcPath = localPath
+		return localPath, nil
+	}
+
+	// 尝试从 embed 提取到临时目录
+	data, err := embeddedFrpc.ReadFile("bin/" + fileName)
+	if err == nil {
+		tmpPath := filepath.Join(os.TempDir(), "frpc")
+		if runtime.GOOS == "windows" {
+			tmpPath += ".exe"
+		}
+		if err := os.WriteFile(tmpPath, data, 0755); err == nil {
+			cachedFrpcPath = tmpPath
+			return tmpPath, nil
+		}
+		if _, statErr := os.Stat(tmpPath); statErr == nil {
+			cachedFrpcPath = tmpPath
+			return tmpPath, nil
+		}
+	}
+
+	// 最后尝试从系统 PATH 查找
+	path, err := exec.LookPath("frpc")
+	if err == nil {
+		cachedFrpcPath = path
+		return path, nil
+	}
+
+	return "", fmt.Errorf("未找到 frpc 文件")
+}