Automate releases from PR titles and clean up CI workflows.

Add release and PR title checks, shared CI scripts, Gitea PR template, and align pyproject.toml to v0.3.1.

Co-authored-by: Cursor <[email protected]>

.pre-commit-config.yaml

@@ -30,7 +30,7 @@ repos:
     rev: v3.20.0
     hooks:
       - id: pyupgrade
-        args: ["--py311-plus"]
+        args: ["--py312-plus"]
 
   # Formatting for Markdown, JSON, and YAML with Prettier
   - repo: https://github.com/pre-commit/mirrors-prettier