feat: 统一服务缓存 + 指纹驱动插件匹配

将 webServiceCache 扩展为通用 serviceCache，所有指纹识别结果
统一缓存，插件匹配时端口不命中则回退到服务名称匹配。

删除多余的 service_cache.go，复用已有的 ServiceInfo 体系。
补充 nil 防御、Explicit 标记、大量单元/集成/回归测试。

webscan/lib/Client.go

@@ -9,6 +9,7 @@ import (
 	"net/http"
 	"net/url"
 	"os"
+	"strconv"
 	"strings"
 	"time"
 
@@ -106,7 +107,7 @@ func configureHTTPProxy(tr *http.Transport, legacyProxy string, networkConfig *c
 		} else if httpProxyURL == ProxyShortcutSocks5 {
 			httpProxyURL = ProxySocks5URL
 		} else if !strings.Contains(httpProxyURL, "://") {
-			httpProxyURL = "http://127.0.0.1:" + httpProxyURL
+			httpProxyURL = normalizeHTTPProxyURL(httpProxyURL)
 		}
 
 		// 验证代理类型
@@ -127,6 +128,13 @@ func configureHTTPProxy(tr *http.Transport, legacyProxy string, networkConfig *c
 	return nil
 }
 
+func normalizeHTTPProxyURL(proxyURL string) string {
+	if _, err := strconv.Atoi(proxyURL); err == nil {
+		return "http://127.0.0.1:" + proxyURL
+	}
+	return "http://" + proxyURL
+}
+
 // InitHTTPClient 创建HTTP客户端
 func InitHTTPClient(ThreadsNum int, DownProxy string, Timeout time.Duration, maxRedirects int, networkConfig *common.NetworkConfig) error {
 	// 配置基础连接参数

webscan/lib/Eval.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"io"
 	"math/rand" //nolint:gosec // G404: math/rand用于生成测试数据，非加密用途
+	"net"
 	"net/http"
 	"net/url"
 	"strconv"
@@ -176,7 +177,7 @@ func URLTypeToString(u *UrlType) string {
 			builder.WriteString("//")
 		}
 		if host := u.Host; host != "" {
-			builder.WriteString(host)
+			builder.WriteString(urlTypeHost(host))
 		}
 	}
 
@@ -525,6 +526,16 @@ func ParseURL(u *url.URL) *UrlType {
 	}
 }
 
+func urlTypeHost(host string) string {
+	if strings.HasPrefix(host, "[") {
+		return host
+	}
+	if ip := net.ParseIP(host); ip != nil && strings.Contains(host, ":") {
+		return "[" + host + "]"
+	}
+	return host
+}
+
 // ParseRequest 将标准 HTTP 请求转换为自定义请求对象
 func ParseRequest(oReq *http.Request) (*Request, error) {
 	req := &Request{

webscan/lib/client_test.go

@@ -0,0 +1,24 @@
+package lib
+
+import "testing"
+
+func TestNormalizeHTTPProxyURL(t *testing.T) {
+	tests := []struct {
+		name string
+		in   string
+		want string
+	}{
+		{name: "port shortcut", in: "8080", want: "http://127.0.0.1:8080"},
+		{name: "ipv4 host port", in: "127.0.0.1:8080", want: "http://127.0.0.1:8080"},
+		{name: "hostname port", in: "proxy.local:8080", want: "http://proxy.local:8080"},
+		{name: "bracketed ipv6 port", in: "[::1]:8080", want: "http://[::1]:8080"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := normalizeHTTPProxyURL(tt.in); got != tt.want {
+				t.Fatalf("normalizeHTTPProxyURL(%q) = %q, want %q", tt.in, got, tt.want)
+			}
+		})
+	}
+}

webscan/lib/eval_test.go

@@ -639,6 +639,15 @@ func TestURLTypeToString(t *testing.T) {
 			},
 			expected: "http://example.com/test",
 		},
+		{
+			name: "IPv6 host",
+			url: &UrlType{
+				Scheme: "http",
+				Host:   "2001:db8::1",
+				Path:   "/test",
+			},
+			expected: "http://[2001:db8::1]/test",
+		},
 		{
 			name: "仅路径",
 			url: &UrlType{