Add example auth tokens to aisbf.json configuration

- Added example tokens array to demonstrate client authentication
- When auth.enabled is true, clients must use Bearer token in Authorization header
- Tokens are validated against the tokens array in aisbf.json

config/aisbf.json

@@ -8,7 +8,10 @@
   },
   "auth": {
     "enabled": false,
-    "tokens": []
+    "tokens": [
+      "your-secret-token-1",
+      "your-secret-token-2"
+    ]
   },
   "dashboard": {
     "enabled": true,