fix(sv): Backups card byte formatter — tenths for GB, MB under 1G

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server.js

@@ -15,7 +15,7 @@ import { mcpAuth } from './lib/api/middleware/mcp_auth.js';
 import { handleMcp } from './lib/mcp/http.js';
 import httpProxy from 'http-proxy';
 
-const VERSION = '2.6.0';
+const VERSION = '2.6.1';
 
 // Proxy /terminal (+ its WebSocket) to ttyd on CT 300, so the embedded terminal
 // works whether the Void is reached via Traefik (void2-app.hynesy.com) OR the