v0.4.10: preallocate decoder direct buffer, fix 5fps video

0.4.9 allocated a fresh w*h*4 direct ByteBuffer on every grab() — at
1080p × 24fps that's ~192 MB/s of direct memory churn (page zero-fill +
Cleaner enqueue). The decoder thread spent most of its frame budget on
memory bookkeeping instead of decoding, fell behind real time, and the
single-slot AtomicReference saw bursty refills that the render thread
could only sample at ~5fps. Game thread was fine, only the video looked
like 5fps.

Replace it with one preallocated direct buffer per backend instance,
filled under a short-held lock on the decoder side. Swap the pollFrame()
ByteBuffer-returning API for consumeFrame(dstAddr, maxBytes) so the
render thread memcpys straight from staging buffer → GPU texture
pointer under the same lock — no allocation, no race window between
"got buffer" and "decoder overwrote it".

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

gradle.properties

@@ -5,7 +5,7 @@ org.gradle.configuration-cache=false
 
 # Mod
 mod_id=video_player
-mod_version=0.4.9
+mod_version=0.4.10
 maven_group=com.ejclaw.videoplayer
 archives_base_name=video_player