fix(settings): display.brightness 默认值改 50(100 太亮; 存量 settings.conf 用户值优先不受影响)

patch_v2/meow_launcherd/meow_settings.c

@@ -66,7 +66,7 @@ static int g_no_file_logged = 0;   /* M2.86：本次「未读到」连续段是
 /* ---- 默认值表：与 SYSTEM_SETTINGS.md §1 逐键一致（新增设置照附录扩展）---- */
 static const meow_setting_def g_defs[] = {
     /* 显示 */
-    { "display.brightness",          SET_INT,  "100",  0, 100, NULL, NULL },
+    { "display.brightness",          SET_INT,  "50",   0, 100, NULL, NULL },
     { "display.brightness_min",      SET_INT,  "1",    0, 255, NULL, NULL },
     { "display.screen_off_mode",     SET_ENUM, "panel",0, 0, "panel,black", "面板下电,背光全黑" },
     { "display.screen_off_timeout",  SET_INT,  "30",   0, 86400, NULL, NULL },