refactor: 删除 deadcode 检测出的未使用函数

- proxy/detector.go: 删除 IsSOCKS5Standard, IsProxyInitialized
- findnet.go: 删除 NetworkInfo.OneLine, TreeFormat 方法
- port_scan.go: 删除 estimateScanTime 函数
- web_scanner.go: 删除 GetFingerprints 函数
- 清理相关测试代码

core/web_scanner_test.go

@@ -577,122 +577,6 @@ func TestWebServiceCache_Concurrent(t *testing.T) {
 // 指纹缓存测试
 // =============================================================================
 
-// TestFingerprintCache 测试指纹缓存操作
-func TestFingerprintCache(t *testing.T) {
-	// 清空缓存
-	fingerprintCacheMutex.Lock()
-	fingerprintCache = make(map[string][]string)
-	fingerprintCacheMutex.Unlock()
-
-	t.Run("存储和读取指纹", func(t *testing.T) {
-		fingerprints := []string{"nginx", "http", "ssl"}
-		SetFingerprints("192.168.1.1", 80, fingerprints)
-
-		result, exists := GetFingerprints("192.168.1.1", 80)
-		if !exists {
-			t.Error("GetFingerprints应返回exists=true")
-		}
-		if len(result) != 3 {
-			t.Errorf("指纹数量 = %d, 期望 3", len(result))
-		}
-		for i, fp := range fingerprints {
-			if result[i] != fp {
-				t.Errorf("指纹[%d] = %q, 期望 %q", i, result[i], fp)
-			}
-		}
-	})
-
-	t.Run("空指纹列表不存储", func(t *testing.T) {
-		SetFingerprints("192.168.1.2", 80, []string{})
-
-		_, exists := GetFingerprints("192.168.1.2", 80)
-		if exists {
-			t.Error("空指纹列表不应被存储")
-		}
-	})
-
-	t.Run("不存在的指纹", func(t *testing.T) {
-		result, exists := GetFingerprints("192.168.1.3", 80)
-		if exists {
-			t.Error("不存在的指纹应返回exists=false")
-		}
-		if result != nil {
-			t.Errorf("不存在的指纹应返回nil, 实际 %v", result)
-		}
-	})
-
-	t.Run("覆盖写入指纹", func(t *testing.T) {
-		fingerprints1 := []string{"nginx"}
-		fingerprints2 := []string{"apache", "php"}
-
-		SetFingerprints("192.168.1.4", 80, fingerprints1)
-		SetFingerprints("192.168.1.4", 80, fingerprints2)
-
-		result, _ := GetFingerprints("192.168.1.4", 80)
-		if len(result) != 2 {
-			t.Errorf("覆盖后指纹数量 = %d, 期望 2", len(result))
-		}
-	})
-
-	t.Run("不同端口独立存储指纹", func(t *testing.T) {
-		fp80 := []string{"http"}
-		fp443 := []string{"https"}
-
-		SetFingerprints("192.168.1.5", 80, fp80)
-		SetFingerprints("192.168.1.5", 443, fp443)
-
-		result80, _ := GetFingerprints("192.168.1.5", 80)
-		result443, _ := GetFingerprints("192.168.1.5", 443)
-
-		if result80[0] != "http" {
-			t.Errorf("端口80指纹 = %v, 期望 ['http']", result80)
-		}
-		if result443[0] != "https" {
-			t.Errorf("端口443指纹 = %v, 期望 ['https']", result443)
-		}
-	})
-}
-
-// TestFingerprintCache_Concurrent 测试指纹缓存并发安全性
-func TestFingerprintCache_Concurrent(t *testing.T) {
-	// 清空缓存
-	fingerprintCacheMutex.Lock()
-	fingerprintCache = make(map[string][]string)
-	fingerprintCacheMutex.Unlock()
-
-	var wg sync.WaitGroup
-	numGoroutines := 100
-
-	// 并发写入
-	for i := 0; i < numGoroutines; i++ {
-		wg.Add(1)
-		go func(id int) {
-			defer wg.Done()
-			fingerprints := []string{"test"}
-			SetFingerprints("192.168.1.1", id, fingerprints)
-		}(i)
-	}
-
-	// 并发读取
-	for i := 0; i < numGoroutines; i++ {
-		wg.Add(1)
-		go func(id int) {
-			defer wg.Done()
-			_, _ = GetFingerprints("192.168.1.1", id)
-		}(i)
-	}
-
-	wg.Wait()
-
-	// 验证数据完整性
-	for i := 0; i < numGoroutines; i++ {
-		_, exists := GetFingerprints("192.168.1.1", i)
-		if !exists {
-			t.Errorf("端口 %d 指纹应存在", i)
-		}
-	}
-}
-
 // =============================================================================
 // 边界情况测试
 // =============================================================================