refactor: consolidate pluginInfo internal/legacy fields

backend/src/plugins/Spam/info.ts

@@ -3,12 +3,11 @@ import { trimPluginDescription } from "../../utils.js";
 import { zSpamConfig } from "./types.js";
 
 export const spamPluginInfo: ZeppelinPluginInfo = {
-  showInDocs: true,
+  type: "legacy",
   prettyName: "Spam protection",
   description: trimPluginDescription(`
     Basic spam detection and auto-muting.
     For more advanced spam filtering, check out the Automod plugin!
   `),
-  legacy: true,
   configSchema: zSpamConfig,
 };