修复：替换 frontends 中 stapp.py 和 stapp2.py 的裸 except 子句#540
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将 `except: pass` 替换为 `except Exception: pass`，符合 Python 最佳实践， 避免捕获系统退出异常（KeyboardInterrupt、SystemExit），确保程序在重新配置 stdout/stderr 失败时仍能正常退出。
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Summary
替换
frontends/stapp.py和frontends/stapp2.py中的裸except:子句为except Exception: pass。Changes
frontends/stapp.pyL7-9：两处except: pass→except Exception: passfrontends/stapp2.pyL6-8：两处except: pass→except Exception: passVerification
ruff check --select E722通过，无 E722 错误python3 -m py_compile语法检查通过Rationale
裸
except:会捕获所有异常，包括SystemExit和KeyboardInterrupt，导致程序在配置 stdout/stderr 失败时无法正常退出。except Exception:仅捕获程序可处理的异常，符合 Python PEP 8 规范。