webui4frpc: 独立可用的可视化 frpc 控制器 (M0)

- 零 frp 源码依赖，单二进制 (Go + Vue3 + VueFlow + Element Plus)
- 画布多对多连线，渲染 tcp/udp/http/https frpc 配置
- worker 进程管理：自愈、日志轮转、崩溃退避重启
- frpc 一键安装 (GitHub Releases) + 手动指定路径
- 三页 UI：状态(默认)/连接配置/设置
- 状态页实时节点/转发状态，节点可增删改启停
- 画布冲突检查：端口/域名冲突标红 + 弹窗拦截保存
- backend 单测覆盖 store/render/process/httpapi/install
- plan.md + FRPC_FEATURES_AUDIT.md 文档

internal/process/process_test.go

@@ -0,0 +1,59 @@
+package process
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func newTestManager(t *testing.T) *Manager {
+	t.Helper()
+	dir := t.TempDir()
+	script := filepath.Join(dir, "fake-frpc")
+	// A fake frpc that sleeps (simulating a healthy worker).
+	if err := os.WriteFile(script, []byte("#!/bin/sh\nsleep 60\n"), 0o700); err != nil {
+		t.Fatal(err)
+	}
+	opts := Options{
+		ConfigsDir: filepath.Join(dir, "configs"),
+		LogsDir:    filepath.Join(dir, "logs"),
+		BinaryPath: func() string { return script },
+		Render: func(name string) ([]byte, error) {
+			return []byte(`{"name":"` + name + `"}`), nil
+		},
+		AutoRestart:     func(string) bool { return false },
+		RestartInterval: func() int { return 1 },
+	}
+	return NewManager(opts)
+}
+
+func TestStartStop(t *testing.T) {
+	pm := newTestManager(t)
+	if err := pm.Start("srv-a"); err != nil {
+		t.Fatal(err)
+	}
+	st, has := pm.Status("srv-a")
+	if !has || st.State != "running" || st.Pid <= 0 {
+		t.Fatalf("status = %+v has=%v", st, has)
+	}
+	if err := pm.Stop("srv-a"); err != nil {
+		t.Fatal(err)
+	}
+	st, has = pm.Status("srv-a")
+	if has {
+		t.Fatalf("after stop has=%v", has)
+	}
+}
+
+func TestConfigWritten(t *testing.T) {
+	pm := newTestManager(t)
+	_ = pm.Start("srv-b")
+	defer pm.Stop("srv-b")
+	data, err := os.ReadFile(pm.ConfigPath("srv-b"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(data) != `{"name":"srv-b"}` {
+		t.Fatalf("config = %s", data)
+	}
+}