add stereo(SDL) audio option

VoidLink/Localization/Localizable.xcstrings

@@ -858,6 +858,35 @@
         }
       }
     },
+    "audioConfigStackTip" : {
+      "extractionState" : "manual",
+      "localizations" : {
+        "en" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "- Stereo: Stereo mode driven by the system audio engine. Offers better audio quality and continues playback when the screen is off.\n\n- Stereo (SDL): Stereo mode driven by the SDL engine. This mode is essentially equivalent to Moonlight-iOS audio. Playback cannot be maintained after the screen is turned off.\n\n- 5.1 / 7.1 Channels: both are driven by the SDL engine. Playback cannot be maintained after the screen is turned off. Available for iOS 18+."
+          }
+        },
+        "zh-Hans" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "- 双声道：由系统音频引擎驱动的双声道模式。音质更好、熄屏可维持播放。\n\n- 双声道(SDL)：由SDL引擎驱动的双声道模式。此模式基本上等价于moonlight-iOS音频。熄屏后无法维持播放。\n\n- 5.1 / 7.1 声道：均为SDL引擎驱动。熄屏后无法维持播放。需 iOS 18 以上支持。"
+          }
+        },
+        "zh-Hant" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "- 雙聲道：由系統音訊引擎驅動的雙聲道模式。音質較佳，且在熄屏後仍可維持播放。\n\n- 雙聲道（SDL）：由 SDL 引擎驅動的雙聲道模式。此模式基本等同於 Moonlight-iOS 的音訊。熄屏後無法維持播放。\n\n5.1／7.1 聲道：皆由 SDL 引擎驅動。熄屏後無法維持播放，需 iOS 18 以上支援。"
+          }
+        },
+        "zh-HK" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "- 雙聲道：由系統音訊引擎驅動的雙聲道模式。音質較佳，且在熄屏後仍可維持播放。\n\n- 雙聲道（SDL）：由 SDL 引擎驅動的雙聲道模式。此模式基本等同於 Moonlight-iOS 的音訊。熄屏後無法維持播放。\n\n5.1／7.1 聲道：皆由 SDL 引擎驅動。熄屏後無法維持播放，需 iOS 18 以上支援。"
+          }
+        }
+      }
+    },
     "Auto tap disabled" : {
       "extractionState" : "manual",
       "localizations" : {