Rename browser demo mount path from /demo to /voice-demo.

Co-authored-by: Cursor <cursoragent@cursor.com>

engine/main.py

@@ -20,7 +20,7 @@ def get_config(path: str = "config.json") -> EngineConfig:
 
 
 def _normalize_mount_path(path: str) -> str:
-    normalized = path.strip() or "/demo"
+    normalized = path.strip() or "/voice-demo"
     if not normalized.startswith("/"):
         normalized = f"/{normalized}"
     return normalized.rstrip("/") or "/"