v0.5.0: Add RBAC auth, LLM router, audit logging, output sanitization

- New: auth.py – Role-based access (operator/approver/viewer)
- New: llm_router.py – Configurable primary/fallback provider chain
- New: audit_log.py + audit_query.py – DSGVO-compliant audit trail
- New: sanitize_output() – masks secrets in bot responses
- Updated: bot.py – Integrated auth guards, router, audit logging
- Updated: ollama_client.py – Router-compatible interface
- Updated: CLOWNFISCHSERVER.md – Documentation updated
- Updated: README.md – Documentation updated

LICENSE

@@ -0,0 +1,17 @@
+GNU GENERAL PUBLIC LICENSE
+Version 3, 29 June 2007
+
+Copyright (C) 2025-2026 Clownfischserver Contributors
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.