chore: 企业级标准化 — 补全社区文档和CI安全配置

Author: xiejianjun000

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+Please include a summary of the change and which issue is fixed.
+
+Fixes # (issue)
+
+## Type of change
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Documentation update
+- [ ] Refactoring
+- [ ] CI/CD
+
+## Checklist
+- [ ] My code follows the style guidelines of this project
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] Tests pass locally