fix: 解决 PR#528 的 review 问题

修复内容：
1. [稳定性提升] 为 CLI 终端探测的 subprocess 添加 timeout=10，防止测试机环境阻塞引发挂起
2. [问题捕获精度] 将底层极为宽泛的 Exception 拦截更改为 OSError，并独立捕获 TimeoutExpired

Author: hect0x7

tests/test_jmcomic/test_jm_cli.py

@@ -54,10 +54,18 @@ def test_entry_points_installed(self):
             )
 
             try:
-                subprocess.run([cmd, "--help"], capture_output=True, text=True, check=True)
+                subprocess.run(
+                    [cmd, "--help"],
+                    capture_output=True,
+                    text=True,
+                    check=True,
+                    timeout=10,
+                )
+            except subprocess.TimeoutExpired:
+                self.fail(f"Command '{cmd} --help' timed out execution.")
             except subprocess.CalledProcessError as e:
                 self.fail(f"Command '{cmd} --help' failed with exit code {e.returncode}. Stderr: {e.stderr.strip()}")
-            except Exception as e:
+            except OSError as e:
                 self.fail(f"Failed to execute command '{cmd}': {e}")
 
     # -- extract_album_id --