fix: align Python metadata with the existing syntax

Author: xingxuling

pyproject.toml

@@ -8,7 +8,7 @@ version = "1.0.1"
 description = "Safe codebase fusion pipeline: scan, plan, preview, apply, verify, diagnose, rollback, and audit code migrations."
 readme = "README.md"
 license = {text = "Apache-2.0"}
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 authors = [
     {name = "TaoWind Interactive Technology Limited"}
 ]
@@ -17,7 +17,6 @@ classifiers = [
     "Intended Audience :: Developers",
     "License :: OSI Approved :: Apache Software License",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",