Fix missing model deps on the Space (lazy export + addict/evo)

depth_anything_3.api imported the whole utils.export chain at module top, pulling
moviepy (export-only, not installed) and crashing load_model. Make that import
lazy (only when export_dir is set, which the demo never does). The remaining core
imports need addict (config dicts in registry/model heads) and evo (pose_align
PosePath3D), which were missing from requirements — add them (pinned to the
known-good versions). Verified by tracing a real load_model+inference run against
this exact code: full pipeline completes, all outputs produced.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

requirements.txt

@@ -16,6 +16,8 @@ einops==0.8.1
 omegaconf==2.3.0
 safetensors==0.7.0
 e3nn==0.5.8
+addict==2.4.0          # depth_anything_3 config dicts (registry / model heads)
+evo==1.34.0            # depth_anything_3.utils.pose_align (PosePath3D)
 
 opencv-python-headless==4.11.0.86
 pillow

src/depth_anything_3/api.py

@@ -31,7 +31,6 @@ from PIL import Image
 from depth_anything_3.cfg import create_object, load_config
 from depth_anything_3.registry import MODEL_REGISTRY
 from depth_anything_3.specs import Prediction
-from depth_anything_3.utils.export import export
 from depth_anything_3.utils.geometry import affine_inverse
 from depth_anything_3.utils.io.input_processor import InputProcessor
 from depth_anything_3.utils.io.output_processor import OutputProcessor
@@ -417,6 +416,11 @@ class DepthAnything3(nn.Module, PyTorchModelHubMixin):
         self, prediction: Prediction, export_format: str, export_dir: str, **kwargs
     ) -> None:
         """Export results to specified format and directory."""
+        # Lazy import: the export chain pulls heavy, export-only deps (moviepy,
+        # etc.) that the inference/demo path never needs. Only import when an
+        # export is actually requested (export_dir set).
+        from depth_anything_3.utils.export import export
+
         start_time = time.time()
         export(prediction, export_format, export_dir, **kwargs)
         end_time = time.time()