model: LFM2-VL fixes (#17577)

* Adjust to pytorch

* Add antialiasing upscale

* Increase number of patches to 1024

* Handle default marker insertion for LFM2

* Switch to flag

* Reformat

* Cuda implementation of antialias kernel

* Change placement in ops.cpp

* consistent float literals

* Pad only for LFM2

* Address PR feedback

* Rollback default marker placement changes

* Fallback to CPU implementation for antialias implementation of upscale

tools/mtmd/mtmd.cpp

@@ -304,6 +304,10 @@ struct mtmd_context {
             img_beg = "<|im_start|>";
             img_end = "<|im_end|>";
 
+        } else if (proj == PROJECTOR_TYPE_LFM2) {
+            img_beg = "<|image_start|>";
+            img_end = "<|image_end|>";
+
         }
     }