docs(seo): topics, badges, NOTICE/CITATION, SECURITY/CONTRIBUTING (#49)

* docs(seo): topics, CITATION, badges, NOTICE

* docs: add SECURITY and CONTRIBUTING

Author: CoderDeltaLAN

CITATION.cff

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+cff-version: 1.2.0
+title: diff-risk-dashboard
+message: "If you use this software, please cite it as below."
+authors: [{ name: CoderDeltaLAN }]
+license: MIT
+repository-code: https://github.com/CoderDeltaLAN/diff-risk-dashboard

CONTRIBUTING.md

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+# Contributing
+- Mantén licencia **MIT** y el archivo `NOTICE`.
+- Atribución requerida en forks y publicaciones.
+- Commits con Conventional Commits. PRs requieren CI verde.

NOTICE

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+diff-risk-dashboard — Copyright (c) CoderDeltaLAN.
+Licensed under MIT. Please retain this NOTICE in copies or substantial portions.

README.md

@@ -311,3 +311,11 @@ Released under the **MIT License**. See [LICENSE](LICENSE).
 ---
 
 **Download this README**: This same file can be downloaded from the chat link.
+
+---
+
+### Status & Distribution
+[![CI](https://github.com/CoderDeltaLAN/diff-risk-dashboard/actions/workflows/build.yml/badge.svg)](../../actions)
+[![CodeQL](https://github.com/CoderDeltaLAN/diff-risk-dashboard/actions/workflows/codeql.yml/badge.svg)](../../actions)
+[![PyPI](https://img.shields.io/pypi/v/diff-risk-dashboard.svg)](https://pypi.org/project/diff-risk-dashboard/)
+[![GHCR](https://img.shields.io/badge/container-ghcr.io-blue)](../../pkgs/container/diff-risk-dashboard)

SECURITY.md

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+# Security Policy
+- Reporta vulnerabilidades por **GitHub → Security → Private reporting**.
+- No abras issues públicos con PoCs explotables.
+- SLA objetivo de primera respuesta: 72h.