feat: 新增 quick 命令 — 免域名一键穿透

cftunnel quick <端口> 无需账户/Token/域名，
自动生成 *.trycloudflare.com 随机公网地址。

cmd/quick.go

@@ -0,0 +1,20 @@
+package cmd
+
+import (
+	"github.com/qingchencloud/cftunnel/internal/daemon"
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	rootCmd.AddCommand(quickCmd)
+}
+
+var quickCmd = &cobra.Command{
+	Use:   "quick <端口>",
+	Short: "快速启动免域名隧道（生成 *.trycloudflare.com 随机域名）",
+	Long:  "无需 Cloudflare 账户、API Token 或域名，一条命令生成临时公网地址。\n适合临时分享、快速调试，Ctrl+C 退出后域名自动失效。",
+	Args:  cobra.ExactArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		return daemon.StartQuick(args[0])
+	},
+}

internal/daemon/quick.go

@@ -0,0 +1,81 @@
+package daemon
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"os/signal"
+	"strings"
+	"syscall"
+)
+
+// StartQuick 启动免域名模式（前台运行，Ctrl+C 退出）
+func StartQuick(port string) error {
+	binPath, err := EnsureCloudflared()
+	if err != nil {
+		return err
+	}
+	if Running() {
+		return fmt.Errorf("cloudflared 已在运行，请先执行 cftunnel down")
+	}
+
+	cmd := exec.Command(binPath, "tunnel", "--url", "http://localhost:"+port)
+
+	// 捕获 stderr 提取随机域名
+	stderr, err := cmd.StderrPipe()
+	if err != nil {
+		return err
+	}
+	cmd.Stdout = os.Stdout
+
+	if err := cmd.Start(); err != nil {
+		return fmt.Errorf("启动 cloudflared 失败: %w", err)
+	}
+
+	// 后台读取 stderr，提取域名并转发输出
+	go scanForURL(stderr)
+
+	// 捕获 Ctrl+C 优雅退出
+	sig := make(chan os.Signal, 1)
+	signal.Notify(sig, syscall.SIGINT, syscall.SIGTERM)
+
+	done := make(chan error, 1)
+	go func() { done <- cmd.Wait() }()
+
+	select {
+	case <-sig:
+		cmd.Process.Signal(syscall.SIGINT)
+		<-done
+	case err := <-done:
+		if err != nil {
+			return fmt.Errorf("cloudflared 异常退出: %w", err)
+		}
+	}
+	return nil
+}
+
+func scanForURL(r io.Reader) {
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		line := scanner.Text()
+		// cloudflared 输出格式: ... https://xxx.trycloudflare.com ...
+		if strings.Contains(line, "trycloudflare.com") {
+			url := extractURL(line)
+			if url != "" {
+				fmt.Printf("\n✔ 隧道已启动: %s\n\n", url)
+			}
+		}
+		fmt.Fprintln(os.Stderr, line)
+	}
+}
+
+func extractURL(line string) string {
+	for _, part := range strings.Fields(line) {
+		if strings.Contains(part, "trycloudflare.com") && strings.HasPrefix(part, "http") {
+			return part
+		}
+	}
+	return ""
+}