feat: add MCP server with resources, tools, auth, and Traefik routing

- Add backend/app/mcp_server.py with FastMCP server (hms-cms)
- Resources: design-rules, page-structure, sync-status
- Tools: trigger_sync, get_sync_log, set_rentman_token, read_file,
  write_file, create_page, deploy, git_commit, git_status
- Bearer token auth via MCP_AUTH_TOKEN env var
- Mount MCP at /mcp with streamable HTTP transport
- Integrate session manager in FastAPI lifespan
- Add Traefik labels for external /mcp route on hms.media-on.de
- Add git, docker.io, curl to backend Dockerfile
- Mount repo root + docker socket in backend container
- Add mcp>=1.0.0 to requirements.txt

frontend-nuxt-old/public/logo.svg

@@ -0,0 +1,9 @@
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+<g>
+	<g>
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+	</g>
+	
+		<rect x="23.598" y="15.343" fill="none" stroke="#EC6925" stroke-width="15.1525" stroke-miterlimit="10" width="155.612" height="168.874"></rect>
+</g>
+</svg>