Allow static assets without auth for ComfyUI proxy

modulepreload links use crossorigin attribute which doesn't send
cookies, so static assets (JS, CSS, fonts, images, JSON) are now
allowed without session authentication.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tensors/server/comfyui_routes.py

@@ -237,11 +237,21 @@ async def logout() -> Response:
     return response
 
 
-def _check_auth(comfy_session: str | None) -> None:
-    """Check if user is authenticated, raise 401 if not."""
+def _check_auth(comfy_session: str | None, path: str = "") -> None:
+    """Check if user is authenticated, raise redirect if not.
+
+    Static assets (JS, CSS, fonts, images) are allowed without auth
+    because modulepreload/crossorigin requests don't send cookies.
+    """
     if not COMFYUI_USER:
         # Auth not configured, allow access
         return
+
+    # Allow static assets without auth (modulepreload doesn't send cookies)
+    static_extensions = {".js", ".css", ".woff", ".woff2", ".ttf", ".png", ".jpg", ".jpeg", ".gif", ".svg", ".ico", ".json"}
+    if any(path.lower().endswith(ext) for ext in static_extensions):
+        return
+
     if not _verify_session_token(comfy_session):
         raise HTTPException(
             status_code=status.HTTP_307_TEMPORARY_REDIRECT,
@@ -252,7 +262,7 @@ def _check_auth(comfy_session: str | None) -> None:
 @router.api_route("/comfy/{path:path}", methods=["GET", "POST", "PUT", "DELETE", "PATCH", "OPTIONS", "HEAD"])
 async def proxy_comfyui(request: Request, path: str, comfy_session: str | None = Cookie(default=None)) -> Response:
     """Proxy all HTTP requests to ComfyUI."""
-    _check_auth(comfy_session)
+    _check_auth(comfy_session, path)
 
     # Build target URL
     target_url = f"{COMFYUI_URL}/{path}"