v0.4.36: suppress command/preload chat broadcast

Command-block and player usage no longer spams chat:
- Command feedback (videoPlace/videoDelete/videoMute) now uses
  sendSuccess(..., false) so only the executor sees it; command blocks
  write to their own output + server log instead of broadcasting to ops.
- Removed client-side [videopreload]/[videocache] notifyChat spam in
  VideoCache; download status remains in the client log via LOG.

Co-Authored-By: Claude Opus 4 <noreply@anthropic.com>

gradle.properties

@@ -5,7 +5,7 @@ org.gradle.configuration-cache=false
 
 # Mod
 mod_id=video_player
-mod_version=0.4.35
+mod_version=0.4.36
 maven_group=com.ejclaw.videoplayer
 archives_base_name=video_player