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/render/render_test.go

@@ -0,0 +1,48 @@
+package render
+
+import (
+	"encoding/json"
+	"testing"
+
+	"webui4frpc/internal/store"
+)
+
+func TestRenderTCPProxy(t *testing.T) {
+	remote := store.Remote{Name: "srv", IP: "1.2.3.4", Port: 7000, Token: "secret"}
+	data, err := Render(remote, []Proxy{
+		{Name: "web", Type: "tcp", LocalIP: "127.0.0.1", LocalPort: 8080, RemotePort: 8080},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	var cfg Config
+	if err := json.Unmarshal(data, &cfg); err != nil {
+		t.Fatal(err)
+	}
+	if cfg.ServerAddr != "1.2.3.4" || cfg.Auth.Token != "secret" {
+		t.Fatalf("cfg = %+v", cfg)
+	}
+	if len(cfg.Proxies) != 1 || cfg.Proxies[0].RemotePort != 8080 {
+		t.Fatalf("proxies = %+v", cfg.Proxies)
+	}
+}
+
+func TestRenderDuplicateServiceGetsPortSuffix(t *testing.T) {
+	remote := store.Remote{Name: "srv", IP: "1.2.3.4", Port: 7000}
+	proxy := []Proxy{
+		{Name: "web", Type: "tcp", LocalIP: "127.0.0.1", LocalPort: 8080, RemotePort: 8080},
+		{Name: "web", Type: "tcp", LocalIP: "127.0.0.1", LocalPort: 8080, RemotePort: 8081},
+	}
+	data, err := Render(remote, proxy)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var cfg Config
+	_ = json.Unmarshal(data, &cfg)
+	if len(cfg.Proxies) != 2 {
+		t.Fatalf("proxies = %+v", cfg.Proxies)
+	}
+	if cfg.Proxies[1].Name != "web-8081" {
+		t.Fatalf("second proxy name = %q", cfg.Proxies[1].Name)
+	}
+}