chore: 升级到 Python 3.14 并现代化代码

- 升级 Docker 基础镜像从 Python 3.12 到 3.14
- 更新 pyproject.toml 支持 Python 3.13/3.14
- 移除 Python 3.8/3.9/3.10/3.11 分类器
- 更新 black 和 mypy 配置目标版本
- 将 get_event_loop() 替换为 get_running_loop() 加上 RuntimeError 处理
- 简化 compute_cost_sync 中的 asyncio.run 使用
- Dict/List/Tuple/Set → dict/list/tuple/set (PEP 585)
- Optional[T] → T | None (PEP 604)
- Union[A, B] → A | B (PEP 604)
- 移除废弃的 typing 导入
- 移除不必要的字符串引号注解

pyproject.toml

@@ -15,11 +15,12 @@ classifiers = [
     "Intended Audience :: Developers",
     "License :: Other/Proprietary License",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
 ]
 requires-python = ">=3.9"
 dependencies = [
@@ -83,7 +84,7 @@ dev-dependencies = [
 
 [tool.black]
 line-length = 100
-target-version = ['py38']
+target-version = ['py312']
 
 [tool.isort]
 profile = "black"
@@ -99,7 +100,7 @@ source = "vcs"
 version-file = "src/_version.py"
 
 [tool.mypy]
-python_version = "3.9"
+python_version = "3.12"
 warn_return_any = true
 warn_unused_configs = true
 disallow_untyped_defs = true