feat(ui): expose sales workspace from dashboard shells

gateway/app.py

@@ -297,6 +297,12 @@ def operator_ui() -> FileResponse:
     return FileResponse(_OPERATOR_UI_DIR / "index.html")
 
 
+@app.get("/dashboard")
+def dashboard_ui() -> FileResponse:
+    # Backward-compatible entrypoint used in production bookmarks.
+    return operator_ui()
+
+
 @app.get("/supervisor")
 def supervisor_ui() -> FileResponse:
     if not _SUPERVISOR_UI_DIR.exists():