fix(audio): CS43198 音量寄存器=衰减量(0最响255静音),四路(launcher/audio.c+audiod+watchdog+SDK vol)统一反转映射 dac=255-pct*255/100 — 修「0档炸50档最低」。真机 audiod 热修版实测 L/R 值方向正确

patch_v2/meow_audiod/meow_audiod.c

@@ -467,7 +467,7 @@ static int amixer_get(int numid, int card)
 
 static void dac_vol_set(int pct)
 {
-    int dac = pct * 255 / 100;
+    int dac = 255 - pct * 255 / 100;   /* CS43198 寄存器=衰减量(0=最响 255=静音)，用户 pct 越大越响 → 反转映射 */
     if (dac < 0) dac = 0;
     if (dac > 255) dac = 255;
     amixer_set(1, dac, 1);