fix: Add empty dicts for unichain and base in config

Also fix example: we need a checked amount or slippage set now

--- don't change below this line ---
ENG-4332 Took 6 minutes

config/protocol_specific_addresses.json

@@ -7,5 +7,7 @@
       "native_token_address": "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE",
       "meta_registry_address": "0xF98B45FA17DE75FB1aD0e7aFD971b0ca00e379fC"
     }
-  }
+  },
+  "base": {},
+  "unichain": {}
 }