feat(cli): add settings menu and VLESS log viewer with core selection

- Add settings menu to switch between Xray and V2Ray cores for VLESS connections
- Implement core type persistence in configuration with LoadSettings/SaveSettings
- Add VLESS error and access log viewer showing last 30 and 20 lines respectively
- Display current core type and system time in main menu
- Update VLESS connection to use selected core dynamically
- Refactor monitor.go to accept 'q' key input for graceful exit instead of signal handling
- Add proxy platform-specific implementations (proxy_unix.go, proxy_windows.go)
- Add downloader module for managing binary resources
- Include V2Ray and Xray configuration files and geodata (geoip.dat, geosite.dat)
- Update CLI imports to include path/filepath and time packages
- Improve user experience with core selection visibility and log diagnostics

internal/config/config.go

@@ -11,8 +11,10 @@ var (
 	SubscriptionsFile string
 	ConfigsFile       string
 	StateFile         string
+	SettingsFile      string
 	LogsDir           string
 	XrayDir           string
+	V2RayDir          string
 )
 
 type WireGuardConfig struct {
@@ -51,6 +53,10 @@ type ConnectionState struct {
 	LogFile    string `json:"log_file"`
 }
 
+type Settings struct {
+	CoreType string `json:"core_type"` // "xray" или "v2ray"
+}
+
 // Init инициализирует конфигурационные директории и файлы
 func Init() error {
 	// Получаем рабочую директорию
@@ -63,8 +69,10 @@ func Init() error {
 	SubscriptionsFile = filepath.Join(ConfigDir, "subscriptions.json")
 	ConfigsFile = filepath.Join(ConfigDir, "configs.json")
 	StateFile = filepath.Join(ConfigDir, "state.json")
+	SettingsFile = filepath.Join(ConfigDir, "settings.json")
 	LogsDir = filepath.Join(workDir, "logs")
 	XrayDir = filepath.Join(workDir, "xray")
+	V2RayDir = filepath.Join(workDir, "v2ray")
 
 	// Создаем директории
 	if err := os.MkdirAll(ConfigDir, 0755); err != nil {
@@ -84,6 +92,9 @@ func Init() error {
 	if err := initFileIfNotExists(StateFile, ConnectionState{}); err != nil {
 		return err
 	}
+	if err := initFileIfNotExists(SettingsFile, Settings{CoreType: "xray"}); err != nil {
+		return err
+	}
 
 	return nil
 }
@@ -170,3 +181,32 @@ func SaveState(state *ConnectionState) error {
 	}
 	return os.WriteFile(StateFile, data, 0644)
 }
+
+// LoadSettings загружает настройки
+func LoadSettings() (*Settings, error) {
+	data, err := os.ReadFile(SettingsFile)
+	if err != nil {
+		return nil, err
+	}
+
+	var settings Settings
+	if err := json.Unmarshal(data, &settings); err != nil {
+		return nil, err
+	}
+
+	// По умолчанию xray
+	if settings.CoreType == "" {
+		settings.CoreType = "xray"
+	}
+
+	return &settings, nil
+}
+
+// SaveSettings сохраняет настройки
+func SaveSettings(settings *Settings) error {
+	data, err := json.MarshalIndent(settings, "", "  ")
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(SettingsFile, data, 0644)
+}