Remove --no-cache from docker build to cache Whisper model

Docker layer caching will now preserve the Whisper model download step,
avoiding 1.5GB download on every deployment.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

deploy.sh

@@ -27,7 +27,7 @@ log "Git pull completed"
 
 # Rebuild and restart containers
 log "Rebuilding Docker containers..."
-docker compose -f "$COMPOSE_FILE" build --no-cache
+docker compose -f "$COMPOSE_FILE" build
 
 log "Restarting containers..."
 docker compose -f "$COMPOSE_FILE" down