fix: pin js-dos to v8.3.14 (emulators 8.3.3) — the last working CDN version

The js-dos CDN 'latest' was upgraded to 8.3.20 (emulators 8.3.8)
which ships a rebuilt wlibzip.wasm (113,081 bytes vs 112,732 in
8.3.3). The _zipfile_add WASM function in this newer libzip binary
fails on our bundles with 'Unable to add .jsdos/jsdos.json into
bundle.zip', breaking ALL games.

Pinning to 8.3.14 (emulators 8.3.3, wlibzip.wasm 112,732 bytes)
restores the working libzip WASM. The JavaScript wrapper code is
identical between versions — only the compiled WASM binary differs.

Also restored .jsdos/ config files in bundles (no longer need to
strip them) and reverted the autoStart workaround.

frontend/src/pages/Play.svelte

@@ -44,7 +44,7 @@
     // Load js-dos CSS
     const link = document.createElement("link");
     link.rel = "stylesheet";
-    link.href = "https://v8.js-dos.com/latest/js-dos.css";
+    link.href = "https://v8.js-dos.com/8.xx/8.3.14/js-dos.css";
     document.head.appendChild(link);
     injectedLink = link;
 
@@ -53,7 +53,7 @@
       try {
         await new Promise((resolve, reject) => {
           const s = document.createElement("script");
-          s.src = "https://v8.js-dos.com/latest/js-dos.js";
+          s.src = "https://v8.js-dos.com/8.xx/8.3.14/js-dos.js";
           s.onload = resolve;
           s.onerror = reject;
           document.head.appendChild(s);
@@ -70,7 +70,7 @@
     try {
       const url = isSetup ? setupBundleUrl(game) : bundleUrl(game);
       if (!url || !window.Dos) throw new Error("Failed to resolve game bundle");
-      dosCI = await window.Dos(dosContainer, { url, autoStart: true, countDownStart: 0 });
+      dosCI = await window.Dos(dosContainer, { url });
       running = true;
     } catch (e) {
       error = e.message;