fix: lazy-import torch/safetensors in network gateway, update stale comments

Move torch and safetensors imports inside huggingface_vae_decode() so
CivitAI and Distribution functions still work if those packages are
missing. Update stale "Uses urllib" comments to reference the gateway.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

distribution_routes.py

@@ -548,7 +548,7 @@ def notify_workers_to_start(worker_urls, master_url, session_name, sync_models_t
     Notify remote worker ComfyUI instances to start processing.
     Sends POST /distribution/start_worker to each worker URL.
 
-    Uses urllib.request (no 'requests' library for ComfyUI Registry compliance).
+    Uses network_utils.py gateway for all outbound requests.
 
     Args:
         worker_urls: List of worker base URLs

distribution_worker.py

@@ -656,7 +656,7 @@ class WorkerThread(threading.Thread):
     def _submit_result(self, job_id, image_bytes, meta, max_retries=3):
         """
         Upload image + metadata to master via multipart POST.
-        Uses urllib (no 'requests' library for ComfyUI Registry compliance).
+        Uses network_utils.py gateway for all outbound requests.
         Retries on transient network errors (connection reset, timeout).
         """
         # JSON-safe meta (ensure no non-serializable types from config round-trip)

network_utils.py

@@ -16,9 +16,6 @@ import urllib.request
 import urllib.error
 import urllib.parse
 
-import torch
-from safetensors.torch import _tobytes
-
 
 # =============================================================================
 # 1. CIVITAI API — Model/LoRA metadata lookup
@@ -91,6 +88,11 @@ def huggingface_vae_decode(endpoint_url, tensor, height, width):
         ValueError: If endpoint_url is not in the allowlist
         RuntimeError: If the remote endpoint returns non-200
     """
+    # Lazy imports — only needed for HF VAE, avoids breaking CivitAI/Distribution
+    # if torch or safetensors are not installed
+    import torch
+    from safetensors.torch import _tobytes
+
     # Validate endpoint against allowlist
     if endpoint_url not in HUGGINGFACE_VAE_ENDPOINTS.values():
         raise ValueError(