refactor: split model loader from model definitions (#1619)

src/model/vae/ltx_audio_vae.hpp

@@ -8,6 +8,7 @@
 #include <vector>
 
 #include "core/ggml_extend.hpp"
+#include "model_loader.h"
 
 namespace LTXV {
 

src/model/vae/ltx_vae.hpp

@@ -12,6 +12,7 @@
 #include "model/diffusion/ltxv.hpp"
 #include "model/vae/vae.hpp"
 #include "model/vae/wan_vae.hpp"
+#include "model_loader.h"
 
 namespace LTXVAE {
 

src/model/vae/wan_vae.hpp

@@ -7,6 +7,7 @@
 
 #include "model/common/block.hpp"
 #include "model/vae/vae.hpp"
+#include "model_loader.h"
 
 namespace WAN {