test: 配置用例改用临时目录绝对路径，兼容 Linux runner

internal/config/config_test.go

@@ -64,6 +64,7 @@ func TestLoadCreatesDefaultFile(t *testing.T) {
 
 func TestLoadParsesValues(t *testing.T) {
 	dir := t.TempDir()
+	absLogDir := t.TempDir() // 各平台都是绝对路径，避免把 Windows 盘符写进用例
 	body := "\ufeff# 注释\n" +
 		"listen_ip = 127.0.0.1\r\n" +
 		"\r\n" +
@@ -75,7 +76,7 @@ func TestLoadParsesValues(t *testing.T) {
 		"open_browser = 0\r\n" +
 		"screen_public = false\r\n" +
 		"log_enabled = on\r\n" +
-		"log_dir = D:\\logs\r\n"
+		"log_dir = " + absLogDir + "\r\n"
 	path := writeFile(t, dir, FileName, body)
 
 	cfg, err := Load(path, dir)
@@ -97,7 +98,7 @@ func TestLoadParsesValues(t *testing.T) {
 	if cfg.Timezone != "Asia/Shanghai" || cfg.OpenBrowser || cfg.ScreenPublic || !cfg.LogEnabled {
 		t.Fatalf("其余配置不对: %+v", cfg)
 	}
-	if cfg.LogDir != "D:\\logs" {
+	if cfg.LogDir != absLogDir {
 		t.Fatalf("绝对路径被改写: %s", cfg.LogDir)
 	}
 	if cfg.Addr() != "127.0.0.1:19000" {