fix(v1-api): pass required config to DensePoseHead — green main CI

The "Continuous Integration" workflow (Performance Tests + API
Documentation jobs) has failed on every main commit since the API start
path was exercised: pose_service._initialize_models() called
`DensePoseHead()` with no args, but DensePoseHead.__init__ requires a
config dict → "TypeError: DensePoseHead.__init__() missing 1 required
positional argument: 'config'" → uvicorn "Application startup failed".

Pass a config: input_channels=256 (matches the modality translator's
output), num_body_parts=24 (DensePose standard), num_uv_coordinates=2.
Both call sites (with/without pose_model_path) fixed.

Verified locally: DensePoseHead(config) + ModalityTranslationNetwork(config)
both construct + eval, clearing the startup TypeError.

archive/v1/src/services/pose_service.py

@@ -107,16 +107,25 @@ class PoseService:
     async def _initialize_models(self):
         """Initialize neural network models."""
         try:
-            # Initialize DensePose model
+            # Initialize DensePose model. DensePoseHead requires a config
+            # dict — input_channels matches the modality translator's output
+            # (256), with the standard DensePose 24 body parts and 2 (U,V)
+            # coordinates. (Previously called with no args → TypeError at
+            # startup, which broke the API service.)
+            densepose_config = {
+                'input_channels': 256,
+                'num_body_parts': 24,
+                'num_uv_coordinates': 2,
+            }
             if self.settings.pose_model_path:
-                self.densepose_model = DensePoseHead()
+                self.densepose_model = DensePoseHead(densepose_config)
                 # Load model weights if path is provided
                 # model_state = torch.load(self.settings.pose_model_path)
                 # self.densepose_model.load_state_dict(model_state)
                 self.logger.info("DensePose model loaded")
             else:
                 self.logger.warning("No pose model path provided, using default model")
-                self.densepose_model = DensePoseHead()
+                self.densepose_model = DensePoseHead(densepose_config)
             
             # Initialize modality translation
             config = {