refactor: 重构执行器和CliRunner，简化策略类型实现

1.  将Strategy枚举改为Literal类型，移除normalize_strategy函数
2.  内联策略验证逻辑到run函数中
3.  使用dataclasses.field重构CliRunner的初始化方式
4.  修复测试用例中的函数名和调用方式不匹配问题
5.  调整部分测试用例的构造语法，适配新的API
6.  修正pymake模块中的函数重命名和条件变量命名问题
7.  为部分耗时测试添加@pytest.mark.slow标记

tests/cli/test_pymake.py

@@ -1,6 +1,6 @@
 """Tests for pymake CLI."""
 
-from pyflowx.cli.pymake import _get_maturin_build_command, build_graphs, conf
+from pyflowx.cli.pymake import build_graphs, conf, get_maturin_build_command
 
 
 def test_pymake_config_attributes():
@@ -23,8 +23,8 @@ def test_pymake_config_values():
 
 
 def test_get_maturin_build_command_basic():
-    """Test _get_maturin_build_command returns base command."""
-    cmd = _get_maturin_build_command()
+    """Test get_maturin_build_command returns base command."""
+    cmd = get_maturin_build_command()
     assert "maturin" in cmd
     assert "build" in cmd
     assert "-r" in cmd
@@ -97,7 +97,7 @@ def test_maturin_build_command_graph_structure():
     specs = graph.all_specs()
     assert len(specs) == 1
     spec = graph.spec("maturin_build")
-    assert spec.cmd == _get_maturin_build_command()
+    assert spec.cmd == get_maturin_build_command()
 
 
 def test_install_all_command_graph_structure():