Move public assets to stable paths

scripts/setup.mjs

@@ -5,7 +5,8 @@ import { prepareAssets } from "./assets.mjs";
 if (!existsSync(".env.local")) await copyFile(".env.example", ".env.local");
 await mkdir(".data", { recursive: true });
 await mkdir("public/generated", { recursive: true });
-await mkdir("public/downloads", { recursive: true });
+await mkdir("public/tools/mod", { recursive: true });
+await mkdir("public/tools/plugin", { recursive: true });
 await new Promise((resolve, reject) => {
   const p = spawn(
     process.execPath,