Document session 2026-01-19 and prepare next session

- Add complete session documentation in past-sessions/
- Update NEXT-SESSION.md with Frontend + Agents roadmap
- Add K8s manifests for backend deployment
- Update README with past-sessions reference

Session achievements:
- Implemented complete REST API (projects, tasks, agents)
- Implemented MCP Server with 4 core tools
- Integrated Gitea API client
- Successfully deployed backend to K8s at api.fuq.tv
- Fixed MariaDB permissions and secrets
- CI/CD pipeline working (build #7 successful)

Co-Authored-By: Claude Sonnet 4.5 (1M context) <noreply@anthropic.com>

README.md

@@ -38,6 +38,9 @@ Tarea → Agente → Código → PR → Preview Deploy → Aprobación → Stagi
 - **[AGENT-GUIDE.md](AGENT-GUIDE.md)** - Guía para agentes IA
 - **[TROUBLESHOOTING.md](TROUBLESHOOTING.md)** - Solución de problemas
 
+### 📜 Historial
+- **[past-sessions/](past-sessions/)** - Documentación de cada sesión de desarrollo
+
 ### 📖 Documentación Completa
 - **[docs/](docs/)** - 40+ archivos de documentación detallada
   - `01-arquitectura/` - Diseño del sistema