fix cli command type checker (#1114)

rdagent/app/qlib_rd_loop/quant.py

@@ -118,7 +118,13 @@ class QuantRDLoop(RDLoop):
             self.trace.hist.append((prev_out["running"], feedback))
 
 
-def main(path=None, step_n=None, loop_n=None, all_duration=None, checkout=True):
+def main(
+    path=None,
+    step_n: int | None = None,
+    loop_n: int | None = None,
+    all_duration: str | None = None,
+    checkout: bool = True,
+):
     """
     Auto R&D Evolving loop for fintech factors.
     You can continue running session by