Add Gitea Actions workflows, CI config, and docs

CONTRIBUTING.md

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+# Contributing to ${REPO_NAME}
+
+Thank you for your interest in contributing! Here's how to get started.
+
+## Getting Started
+
+1. Fork this repository on [git.hiddenden.cafe](https://git.hiddenden.cafe).
+2. Clone your fork locally.
+3. Create a feature branch: `git checkout -b feature/my-change`
+4. Make your changes and commit with clear messages.
+5. Push to your fork and open a Pull Request.
+
+## Development
+
+```bash
+# Install dependencies
+pip install -r requirements.txt  # Python
+npm ci                           # Node (if applicable)
+
+# Run checks locally before pushing
+make fmt
+make lint
+make test
+```
+
+## Pull Request Guidelines
+
+- Fill out the PR template completely.
+- Keep PRs focused — one logical change per PR.
+- Ensure CI passes (lint + tests).
+- Update documentation if your change affects behavior.
+
+## Code Style
+
+- Python: Follow PEP 8. We use **ruff** for linting and **black** for formatting.
+- JavaScript/TypeScript: Follow the project's ESLint config if present.
+- Use `.editorconfig` settings (your editor should pick them up automatically).
+
+## Reporting Issues
+
+Use the issue templates provided:
+- **Bug Report** — for defects
+- **Feature Request** — for new ideas
+- **Question / Support** — for help
+
+For security issues, see [SECURITY.md](SECURITY.md).
+
+## Code of Conduct
+
+Please read and follow our [Code of Conduct](CODE_OF_CONDUCT.md).