feat: v6 rewrite

CONTRIBUTING.md

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+## Contributing
+
+Thanks for helping improve Cameradar.
+Please keep changes focused and aligned with the project goals.
+
+## Development setup
+
+- Go 1.25 or later
+- Docker (optional, for container testing)
+
+Clone the repo and install dependencies using Go modules.
+
+```bash
+go mod download
+```
+
+## Run tests
+
+```bash
+make test
+```
+
+## Formatting and linting
+
+Run `gofmt` on changed files.
+Keep code idiomatic and consistent with existing style.
+
+```bash
+make fmt
+```
+
+## Reporting issues
+
+Use the issue template in [.github/ISSUE_TEMPLATE.md](.github/ISSUE_TEMPLATE.md).
+Include the version, environment, and repro steps.
+Only scan authorized targets.
+
+## Pull requests
+
+1. Create a feature branch from `master`.
+2. Keep PRs focused and small.
+3. Update documentation when behavior changes.
+4. Add or update tests when possible.
+5. Ensure `make test` passes.
+6. Try to bring as much test coverage as possible with your changes.