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]>

.gitea/workflows/pr-title-check.yml

@@ -0,0 +1,23 @@
+name: PR Title Check
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  check-title:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Check PR title when source files change
+        env:
+          PR_TITLE: ${{ github.event.pull_request.title }}
+        run: |
+          git fetch origin "${{ github.base_ref }}"
+          git diff --name-only "origin/${{ github.base_ref }}...HEAD" \
+            | scripts/ci/check-pr-title.sh "$PR_TITLE"