chore: 调整Python版本与依赖适配，新增性能报告测试与工具函数

1.  将Python版本从3.13降级到3.11
2.  为typing-extensions添加版本适配标记
3.  简化dev依赖组，移除pysnooper
4.  重构perf_timer，提取_generate_report独立函数
5.  新增性能报告生成与测试用例

pyproject.toml

@@ -13,7 +13,7 @@ classifiers = [
 ]
 dependencies = [
     "graphlib_backport >= 1.0.0; python_version < '3.9'",
-    "typing-extensions>=4.13.2",
+    "typing-extensions>=4.13.2; python_version < '3.10'",
 ]
 description = "Lightweight, type-safe DAG task scheduler with multi-strategy execution."
 keywords = ["async", "dag", "scheduler", "task", "workflow"]
@@ -93,10 +93,7 @@ packages = ["src/pyflowx"]
 pyflowx = { workspace = true }
 
 [dependency-groups]
-dev = [
-    "pyflowx[dev,office,llm]",
-    "pysnooper>=1.2.3",
-]
+dev = ["pyflowx[dev,office,llm]"]
 
 [tool.coverage.run]
 branch      = true