🔧 chore(workflow): require Python 3.11 in runners

.gitea/workflows/checks.yml

@@ -118,7 +118,7 @@ jobs:
           # 注：经 workflow_run 触发，事件 payload 为 workflow_run，不含 PR title；
           # lint 脚本会回落到 head commit message 校验（PR 标题本身不再校验）。
           echo "🔍 检查 commit message 规范（上游事件: $SOURCE_EVENT）..."
-          python3 .gitea/ci/commit_message_lint.py
+          python3.11 .gitea/ci/commit_message_lint.py
           echo "✅ Lint 检查通过"
 
       - name: 🧪 运行全量测试
@@ -135,14 +135,14 @@ jobs:
           npm ci --ignore-scripts --no-audit --no-fund --no-bin-links
 
           echo "📋 覆盖：CLI、subtree/snapshot 部署路线、模板同步、文档一致性"
-          python3 -m unittest discover -s test -p "test_*.py" -v
+          python3.11 -m unittest discover -s test -p "test_*.py" -v
           echo "✅ Python 测试通过"
 
           echo "========================================"
           echo "🧭 TSL Syntax Reference 结构检查"
           echo "========================================"
 
-          python3 skills/tsl-syntax-reference/scripts/lookup.py --check
+          python3.11 skills/tsl-syntax-reference/scripts/lookup.py --check
           echo "✅ TSL Syntax Reference 结构检查通过"
 
           echo "========================================"
@@ -156,7 +156,7 @@ jobs:
           echo "🔗 文档链接检查"
           echo "========================================"
 
-          python3 test/integration/check_doc_links.py
+          python3.11 test/integration/check_doc_links.py
           echo "✅ 文档链接检查通过"
           echo "🎉 所有测试完成"