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;

src/main/java/com/dostalgia/UploadResource.java

@@ -512,6 +512,19 @@ public class UploadResource {
     );
 
     private void createBundle(Path extractDir, String exePath, List<String> cdImages, Path bundlePath) throws IOException {
+        // Write .jsdos config directly into the extract directory
+        Path jsdos = extractDir.resolve(".jsdos");
+        Files.createDirectories(jsdos);
+        if (exePath != null) {
+            String relExe = extractDir.relativize(Path.of(exePath)).toString();
+            Files.writeString(jsdos.resolve("dosbox.conf"), buildDosboxConf(relExe, cdImages));
+            Files.write(jsdos.resolve("jsdos.json"), buildJsdosJson(relExe));
+        } else {
+            // CD-only game — no executable, mount CD and show a DOS prompt
+            Files.writeString(jsdos.resolve("dosbox.conf"), buildCdOnlyDosboxConf(cdImages));
+            Files.write(jsdos.resolve("jsdos.json"), buildCdOnlyJsdosJson());
+        }
+
         // ZIP it up directly from extractDir (no temp copy)
         try (var zos = new java.util.zip.ZipOutputStream(Files.newOutputStream(bundlePath))) {
 
@@ -537,9 +550,26 @@ public class UploadResource {
                 zos.closeEntry();
             }
 
-            // ── Phase 3: All game files ──
+            // ── Phase 3: .jsdos config files (must come before game files) ──
+            try (var walk = Files.walk(jsdos)) {
+                walk.filter(Files::isRegularFile)
+                    .sorted()
+                    .forEach(f -> {
+                        try {
+                            String entryName = extractDir.relativize(f).toString().replace('\\', '/');
+                            zos.putNextEntry(new java.util.zip.ZipEntry(entryName));
+                            Files.copy(f, zos);
+                            zos.closeEntry();
+                        } catch (IOException e) {
+                            throw new UncheckedIOException(e);
+                        }
+                    });
+            }
+
+            // ── Phase 4: All other game files ──
             try (var walk = Files.walk(extractDir)) {
                 walk.filter(Files::isRegularFile)
+                    .filter(f -> !f.startsWith(jsdos))
                     .filter(f -> {
                         String n = f.getFileName().toString().toLowerCase();
                         int dot = n.lastIndexOf('.');
@@ -558,6 +588,11 @@ public class UploadResource {
                     });
             }
         }
+
+        // Clean up .jsdos config files from the extract dir
+        Files.walk(jsdos).sorted(Comparator.reverseOrder()).forEach(p -> {
+            try { Files.deleteIfExists(p); } catch (IOException ignored) {}
+        });
     }
 
     // ─── Configuration Helpers ──────────────────────────────────