Add ONNX model inference implementations for MoGe-2, BEN2, and DA3

- Introduced `onnx_moge2.py` for MoGe-2 ONNX inference with NumPy post-processing.
- Added `onnx_ben2.py` for BEN2 ONNX inference with Pillow and NumPy preprocessing.
- Created `onnx_da3.py` for Depth Anything 3 inference with ONNX Runtime and NumPy.
- Implemented shared ONNX Runtime session helpers in `onnx_runtime.py`.
- Developed unit tests for server functionalities in `test_server.py`, including model caching and job management.
- Enhanced job server to handle frame extraction without requiring models.

src/snapform/server/__init__.py

@@ -0,0 +1,64 @@
+"""SnapForm Job Server without Blender dependencies."""
+
+import sys
+from pathlib import Path
+
+
+SERVER_DIRECTORY = Path(__file__).resolve().parent
+ADDON_DIRECTORY = SERVER_DIRECTORY.parent
+for import_directory in (SERVER_DIRECTORY, ADDON_DIRECTORY):
+    if str(import_directory) not in sys.path:
+        sys.path.insert(0, str(import_directory))
+
+try:
+    from ..blendjob import JobServer
+except ImportError:
+    from blendjob import JobServer
+
+from .model_manager import ModelManager, ModelSessionCache
+from .background import remove_background as _remove_background
+from .da3 import generate_da3 as _generate_da3
+from .media import extract_frames as _extract_frames
+from .moge2 import generate_moge2 as _generate_moge2
+
+
+server = JobServer("SnapForm Job Server")
+
+
+@server.resource("model_manager")
+def create_model_manager(job_server):
+    return ModelManager(job_server.storage_root / "models")
+
+
+@server.job("download-model")
+def download_model(context, parameters):
+    manager = context.resource("model_manager")
+    return manager.download(context, parameters["model"])
+
+
+@server.job("debug-ben2")
+@server.job("remove-background")
+def remove_background(context, parameters):
+    return _remove_background(context, parameters)
+
+
+@server.job("extract-frames")
+def extract_frames(context, parameters):
+    return _extract_frames(context, parameters)
+
+
+@server.job("debug-moge2")
+@server.job("generate-moge2-surface")
+@server.job("generate-moge2-depth")
+def generate_moge2(context, parameters):
+    return _generate_moge2(context, parameters)
+
+
+@server.job("debug-da3")
+@server.job("generate-da3-surface")
+@server.job("generate-da3-depth")
+def generate_da3(context, parameters):
+    return _generate_da3(context, parameters)
+
+
+__all__ = ("ModelManager", "ModelSessionCache", "server")