Add model catalog with specifications for DA3 and MoGe-2 models

- Introduced ModelSpec dataclass to define model attributes.
- Added multiple models including DA3 Small, Base, Giant 1.1, Nested Giant Large 1.1, and MoGe-2 variants.
- Implemented functions to retrieve model details and metadata.
- Included BEN2 model specifications for background removal.

tests/test_models.py

@@ -21,7 +21,7 @@ class ModelTest(unittest.TestCase):
     def setUpClass(cls):
         cls.models = load_module(
             "snapform_models",
-            "src/snapform/server/model_catalog.py",
+            "src/snapform/model_catalog.py",
         )
 
     def test_base_model_is_default_friendly_apache_model(self):