chore: bump version to 1.0.1 with changelog

Patch release for the settings invariant fix. The changelog carries a separate
'behaviour tightening' section because a patch number gives downstreams no
warning that construction can now raise where it previously did not.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "polygateway"
-version = "1.0.0"
+version = "1.0.1"
 description = "PolyGateway：实验室统一的大语言模型（LLM/VLM/OCR）调度与中转库——多源、限流、重试、熔断、缓存、遥测"
 requires-python = ">=3.11"
 dependencies = [