fix asset paths for subdirectory hosting, bump to 0.1.1

The deployed build is served from /file/<name>-<version>/, but Vite
emitted absolute /assets/ URLs and BootScene loaded sprites from
/sprites/. Set base: "./" in vite.config.ts and make the sprite
paths relative so everything resolves next to index.html.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

vite.config.ts

@@ -0,0 +1,8 @@
+import { defineConfig } from "vite";
+
+// The game is served from a versioned subdirectory
+// (https://teletypegames.org/file/<name>-<version>/), so all asset
+// URLs must be relative to index.html.
+export default defineConfig({
+    base: "./",
+});