Collapse dusk.dsk from two zip archives into one, all uncompressed

Bulk assets (mp3, png) are already compressed at the file level, so a
DEFLATE pass on top bought negligible space for real CPU cost. Packs
everything into a single ZIP_STORED archive instead, so every entry
(not just locale/*) gets the reliable repeated seeking/re-opening that
libzip only supports for uncompressed entries. Header shrinks from 32
to 16 bytes; version bumped to 2 so a stale pre-change dusk.dsk is
rejected and rebuilt rather than misread.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

src/duskdolphin/asset/assetdolphindvd.c

@@ -91,9 +91,7 @@ errorret_t assetInitDolphinDVD(void) {
   );
   if(!data) errorThrow("Failed to read asset file from ISO.");
 
-  errorret_t ret = assetDskOpenFromBuffer(
-    data, fileSize, &ASSET.zip, &ASSET.zipStored
-  );
+  errorret_t ret = assetDskOpenFromBuffer(data, fileSize, &ASSET.zip);
   if(errorIsNotOk(ret)) {
     memoryFree(data);
     errorChain(ret);

src/duskdolphin/asset/assetdolphindvd.h

@@ -25,7 +25,7 @@
 
 typedef struct {
   // Whole dusk.dsk blob read from the ISO, kept alive for as long as
-  // ASSET.zip/ASSET.zipStored are open since they're non-owning windows
+  // ASSET.zip is open since it's a non-owning window
   // into it (see assetDskOpenFromBuffer). Freed in assetDisposeDolphinDVD.
   uint8_t *dskData;
 } assetdolphindvd_t;

src/duskdolphin/asset/assetdolphinfat.c

@@ -56,7 +56,7 @@ errorret_t assetInitDolphinFAT(void) {
   if(foundPath[0] == '\0')
     errorThrow("Failed to find asset file on FAT filesystem.");
 
-  errorChain(assetDskOpenFromPath(foundPath, &ASSET.zip, &ASSET.zipStored));
+  errorChain(assetDskOpenFromPath(foundPath, &ASSET.zip));
   errorOk();
 }