fix(android): remove cpal product wording

apps/chanora_flutter/lib/l10n/app_en.arb

@@ -27,7 +27,7 @@
   "aboutLicenseHeading": "License",
   "aboutLicenseBody": "Chanora is dual-licensed under the Apache License, Version 2.0 or the MIT License, at your option. The full license texts ship as LICENSE-APACHE and LICENSE-MIT at the repository root.",
   "aboutThirdPartyHeading": "Third-party software",
-  "aboutThirdPartyBody": "Chanora is built on tsclientlib, flutter_rust_bridge, cpal, rusqlite, and the Flutter framework, among others. See the NOTICE file at the repository root for the current attribution list.",
+  "aboutThirdPartyBody": "Chanora is built on tsclientlib, flutter_rust_bridge, platform-native audio backends, rusqlite, and the Flutter framework, among others. See the NOTICE file at the repository root for the current attribution list.",
   "copyAction": "Copy",
   "closeAction": "Close",
   "startAudioAction": "Start audio",

apps/chanora_flutter/lib/l10n/app_zh.arb

@@ -23,7 +23,7 @@
   "aboutLicenseHeading": "许可协议",
   "aboutLicenseBody": "Chanora 采用 Apache License 2.0 或 MIT License 双协议授权，使用者可任选其一。完整协议文本以 LICENSE-APACHE 与 LICENSE-MIT 形式随仓库一同分发。",
   "aboutThirdPartyHeading": "第三方组件",
-  "aboutThirdPartyBody": "Chanora 基于 tsclientlib、flutter_rust_bridge、cpal、rusqlite、Flutter 框架等开源组件构建。完整归属信息请参阅仓库根目录的 NOTICE 文件。",
+  "aboutThirdPartyBody": "Chanora 基于 tsclientlib、flutter_rust_bridge、平台原生音频后端、rusqlite、Flutter 框架等开源组件构建。完整归属信息请参阅仓库根目录的 NOTICE 文件。",
   "copyAction": "复制",
   "closeAction": "关闭",
   "startAudioAction": "启动语音",

apps/chanora_flutter/lib/l10n/generated/app_localizations.dart

@@ -214,7 +214,7 @@ abstract class AppL10n {
   /// No description provided for @aboutThirdPartyBody.
   ///
   /// In en, this message translates to:
-  /// **'Chanora is built on tsclientlib, flutter_rust_bridge, cpal, rusqlite, and the Flutter framework, among others. See the NOTICE file at the repository root for the current attribution list.'**
+  /// **'Chanora is built on tsclientlib, flutter_rust_bridge, platform-native audio backends, rusqlite, and the Flutter framework, among others. See the NOTICE file at the repository root for the current attribution list.'**
   String get aboutThirdPartyBody;
 
   /// No description provided for @copyAction.

apps/chanora_flutter/lib/l10n/generated/app_localizations_en.dart

@@ -73,7 +73,7 @@ class AppL10nEn extends AppL10n {
 
   @override
   String get aboutThirdPartyBody =>
-      'Chanora is built on tsclientlib, flutter_rust_bridge, cpal, rusqlite, and the Flutter framework, among others. See the NOTICE file at the repository root for the current attribution list.';
+      'Chanora is built on tsclientlib, flutter_rust_bridge, platform-native audio backends, rusqlite, and the Flutter framework, among others. See the NOTICE file at the repository root for the current attribution list.';
 
   @override
   String get copyAction => 'Copy';

apps/chanora_flutter/lib/l10n/generated/app_localizations_zh.dart

@@ -71,7 +71,7 @@ class AppL10nZh extends AppL10n {
 
   @override
   String get aboutThirdPartyBody =>
-      'Chanora 基于 tsclientlib、flutter_rust_bridge、cpal、rusqlite、Flutter 框架等开源组件构建。完整归属信息请参阅仓库根目录的 NOTICE 文件。';
+      'Chanora 基于 tsclientlib、flutter_rust_bridge、平台原生音频后端、rusqlite、Flutter 框架等开源组件构建。完整归属信息请参阅仓库根目录的 NOTICE 文件。';
 
   @override
   String get copyAction => '复制';

crates/chanora_audio/src/engine.rs

@@ -1,4 +1,4 @@
-//! Audio engine — owns the cpal input/output streams, the Opus
+//! Audio engine — owns platform-native capture/playback, the Opus
 //! encoder, and the tsclientlib `AudioHandler` for decode+mix.
 //!
 //! The engine is started after a protocol connection is established