feat: add Wan2.2 S2V (audio+img-to-video) support (#1925)

Co-authored-by: leejet <leejet714@gmail.com>

examples/common/common.h

@@ -131,6 +131,7 @@ struct SDContextParams {
     std::string vae_path;
     std::string vae_format = "auto";
     std::string audio_vae_path;
+    std::string audio_encoder_path;
     std::string taesd_path;
     std::string esrgan_path;
     std::string control_net_path;