chore: add community health files — CoC + issue/PR templates

.github/CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our community a harassment-free experience for everyone, regardless of age, body size, visible or invisible disability, ethnicity, sex characteristics, gender identity and expression, level of experience, education, socio-economic status, nationality, personal appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment:
+- Demonstrating empathy and kindness toward other people
+- Being respectful of differing opinions, viewpoints, and experiences
+- Giving and gracefully accepting constructive feedback
+- Accepting responsibility and apologizing to those affected by our mistakes
+
+Examples of unacceptable behavior:
+- Trolling, insulting or derogatory comments, and personal or political attacks
+- Public or private harassment
+- Publishing others' private information without explicit permission
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported to **nxme176@gmail.com**. All complaints will be reviewed and investigated promptly and fairly.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant](https://www.contributor-covenant.org), version 2.1.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug
+labels: bug
+---
+
+**Describe the bug**
+A clear description of the bug.
+
+**To Reproduce**
+Steps to reproduce.
+
+**Expected behavior**
+What you expected to happen.
+
+**Environment**
+- OS:
+- Version:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea
+labels: enhancement
+---
+
+**Is your feature request related to a problem?**
+A clear description of the problem.
+
+**Describe the solution you'd like**
+What you want to happen.
+
+**Alternatives considered**
+Any alternative solutions.

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+<!-- Describe what this PR changes and why -->
+
+## Type of Change
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work)
+- [ ] Documentation update
+
+## Checklist
+
+- [ ] Code follows the project style (Biome/Ruff)
+- [ ] Tests pass locally
+- [ ] Docs updated if needed