feat(compressors): add SAM+DINO+Hash pipeline for object feature extraction

mini-nav/configs/config.yaml

@@ -2,6 +2,10 @@ model:
   name: "facebook/dinov2-large"
   compression_dim: 512
   device: "auto" # auto-detect GPU
+  sam_model: "facebook/sam2.1-hiera-large"  # SAM model name
+  sam_min_mask_area: 100  # Minimum mask area threshold
+  sam_max_masks: 10  # Maximum number of masks to keep
+  compressor_path: null  # Path to trained HashCompressor weights (optional)
 
 output:
   directory: "./outputs"