chore: initialize clean metapi repository

CONTRIBUTING.md

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+# Contributing
+
+Thanks for contributing to Metapi.
+
+## Development Setup
+
+1. Install dependencies:
+
+```bash
+npm install
+```
+
+2. Copy environment template:
+
+```bash
+cp .env.example .env
+```
+
+3. Run migration and start development:
+
+```bash
+npm run db:migrate
+npm run dev
+```
+
+## Quality Checks
+
+Run before opening a PR:
+
+```bash
+npm test
+npm run build
+```
+
+## Pull Request Guidelines
+
+- Keep PRs focused and small.
+- Add or update tests for behavior changes.
+- Update docs when user-facing behavior/config changes.
+- Avoid committing runtime data (`data/`) or temporary files (`tmp/`).
+
+## Commit Messages
+
+Use concise messages with clear scope, for example:
+
+- `feat: add token route health guard`
+- `fix: handle empty model list in dashboard`
+- `docs: clarify docker env setup`