refactor: 升级依赖版本并优化构建系统

- 升级核心依赖 (axum 0.8, tower-http 0.6, alsa 0.11 等)
- 简化交叉编译配置，切换至 Debian 11 提高兼容性
- 新增 Debian 包打包支持 (debuerreotype 模板)
- 移除独立的 mjpeg 解码器，简化视频模块
- 静态链接 libx264/libx265/libopus 到二进制

src/otg/manager.rs

@@ -423,13 +423,13 @@ mod tests {
     fn test_endpoint_tracking() {
         let mut manager = OtgGadgetManager::with_config("test", 8);
 
-        // Keyboard uses 2 endpoints
+        // Keyboard uses 1 endpoint
         let _ = manager.add_keyboard();
-        assert_eq!(manager.endpoint_allocator.used(), 2);
+        assert_eq!(manager.endpoint_allocator.used(), 1);
 
         // Mouse uses 1 endpoint each
         let _ = manager.add_mouse_relative();
         let _ = manager.add_mouse_absolute();
-        assert_eq!(manager.endpoint_allocator.used(), 4);
+        assert_eq!(manager.endpoint_allocator.used(), 3);
     }
 }

src/otg/service.rs

@@ -558,7 +558,7 @@ mod tests {
 
     #[test]
     fn test_service_creation() {
-        let service = OtgService::new();
+        let _service = OtgService::new();
         // Just test that creation doesn't panic
         assert!(!OtgService::is_available() || true); // Depends on environment
     }