fix(status): catch OSError in os.kill(pid, 0) for Windows compatibility

On Windows, os.kill(nonexistent_pid, 0) raises OSError with WinError 87
("The parameter is incorrect") instead of ProcessLookupError. Without
catching OSError, the acquire_scoped_lock() and get_running_pid() paths
crash on any invalid PID check — preventing gateway startup on Windows
whenever a stale PID file survives from a prior run.

Adapted @phpoh's fix in #12490 onto current main. The main file was
refactored in the interim (get_running_pid now iterates over
(primary_record, fallback_record) with a per-iteration try/except),
so the OSError catch is added as a new except clause after
PermissionError (which is a subclass of OSError, so order matters:
PermissionError must match first).

Co-authored-by: phpoh <1352808998@qq.com>

gateway/status.py

@@ -496,7 +496,8 @@ def acquire_scoped_lock(scope: str, identity: str, metadata: Optional[dict[str,
         if not stale:
             try:
                 os.kill(existing_pid, 0)
-            except (ProcessLookupError, PermissionError):
+            except (ProcessLookupError, PermissionError, OSError):
+                # Windows raises OSError with WinError 87 for invalid pid check
                 stale = True
             else:
                 current_start = _get_process_start_time(existing_pid)
@@ -743,6 +744,10 @@ def get_running_pid(
             if _record_looks_like_gateway(record):
                 return pid
             continue
+        except OSError:
+            # Windows raises OSError with WinError 87 for an invalid pid
+            # (process is definitely gone). Treat as "process doesn't exist".
+            continue
 
         recorded_start = record.get("start_time")
         current_start = _get_process_start_time(pid)