refactor: 拆分 proxy.go 为平台特定文件，兼容 macOS 和 Linux\n\n- proxy.go: 保留通用类型和辅助函数\n- proxy_windows.go: 通过注册表读取 Windows 系统代理\n- proxy_darwin.go: 通过 scutil --proxy 读取 macOS 系统代理\n- proxy_linux.go: 通过 gsettings/kreadconfig 读取 Linux 系统代理"

internal/proxy_linux.go

@@ -0,0 +1,122 @@
+//go:build linux
+
+package internal
+
+import (
+	"fmt"
+	"os/exec"
+	"strings"
+)
+
+// readSystemProxy 从 Linux 系统读取代理配置
+// 优先尝试 GNOME (gsettings)，失败则回退到环境变量
+func readSystemProxy(info *ProxyInfo) error {
+	// 尝试通过 gsettings 读取 GNOME 系统代理
+	if err := readGnomeProxy(info); err == nil && info.Enabled {
+		return nil
+	}
+
+	// 尝试通过 KDE 配置读取代理
+	if err := readKDEProxy(info); err == nil && info.Enabled {
+		return nil
+	}
+
+	// Linux 上环境变量已由 GetCurrentProxy 中读取，此处无需额外操作
+	return nil
+}
+
+// readGnomeProxy 通过 gsettings 读取 GNOME 桌面环境的代理配置
+func readGnomeProxy(info *ProxyInfo) error {
+	// 检查 gsettings 是否可用
+	if _, err := exec.LookPath("gsettings"); err != nil {
+		return fmt.Errorf("gsettings 不可用: %w", err)
+	}
+
+	// 读取代理模式
+	mode, err := gsettingsGet("org.gnome.system.proxy", "mode")
+	if err != nil {
+		return err
+	}
+
+	if mode != "'manual'" {
+		return nil // 代理未启用
+	}
+
+	// 读取 HTTP 代理
+	host, err := gsettingsGet("org.gnome.system.proxy.http", "host")
+	if err == nil && host != "" && host != "''" {
+		host = strings.Trim(host, "'")
+		port, _ := gsettingsGet("org.gnome.system.proxy.http", "port")
+		port = strings.TrimSpace(port)
+		if port != "" && port != "0" {
+			info.Enabled = true
+			info.Server = host + ":" + port
+			info.Protocol = guessProtocol(info.Server)
+			return nil
+		}
+	}
+
+	// 读取 SOCKS 代理
+	host, err = gsettingsGet("org.gnome.system.proxy.socks", "host")
+	if err == nil && host != "" && host != "''" {
+		host = strings.Trim(host, "'")
+		port, _ := gsettingsGet("org.gnome.system.proxy.socks", "port")
+		port = strings.TrimSpace(port)
+		if port != "" && port != "0" {
+			info.Enabled = true
+			info.Server = host + ":" + port
+			info.Protocol = "socks5"
+			return nil
+		}
+	}
+
+	return nil
+}
+
+// readKDEProxy 通过 kreadconfig5/kreadconfig6 读取 KDE 代理配置
+func readKDEProxy(info *ProxyInfo) error {
+	// 尝试 kreadconfig5 或 kreadconfig6
+	var cmd string
+	if _, err := exec.LookPath("kreadconfig6"); err == nil {
+		cmd = "kreadconfig6"
+	} else if _, err := exec.LookPath("kreadconfig5"); err == nil {
+		cmd = "kreadconfig5"
+	} else {
+		return fmt.Errorf("kreadconfig 不可用")
+	}
+
+	// 读取代理类型
+	proxyType, err := kdeGet(cmd, "Proxy Settings", "ProxyType")
+	if err != nil || proxyType != "1" {
+		return nil // 0 = 无代理, 1 = 手动
+	}
+
+	// 读取 HTTP 代理
+	httpProxy, err := kdeGet(cmd, "Proxy Settings", "httpProxy")
+	if err == nil && httpProxy != "" {
+		info.Enabled = true
+		info.Server = extractServerFromURL(httpProxy)
+		info.Protocol = guessProtocol(info.Server)
+		return nil
+	}
+
+	return nil
+}
+
+// gsettingsGet 执行 gsettings get 命令
+func gsettingsGet(schema, key string) (string, error) {
+	out, err := exec.Command("gsettings", "get", schema, key).Output()
+	if err != nil {
+		return "", err
+	}
+	return strings.TrimSpace(string(out)), nil
+}
+
+// kdeGet 执行 kreadconfig 命令读取 KDE 配置
+func kdeGet(cmd, group, key string) (string, error) {
+	out, err := exec.Command(cmd, "--file", "kioslaverc", "--group", group, "--key", key).Output()
+	if err != nil {
+		return "", err
+	}
+	return strings.TrimSpace(string(out)), nil
+}