Add missing apt packages to system-tools role

Adds packages installed on zap that were absent from the playbook:
btop, byobu, fd-find, ffmpeg, gh, mtr-tiny, screen, whois, yt-dlp

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ansible/roles/openclaw/tasks/system-tools-linux.yml

@@ -33,11 +33,23 @@
       - procps
       # System utilities
       - tmux
+      - screen
       - tree
       - jq
       - unzip
       - rsync
       - less
+      - mtr-tiny
+      - whois
+      - byobu
+      # Modern CLI replacements / extras
+      - btop
+      - fd-find
+      # Media
+      - ffmpeg
+      - yt-dlp
+      # GitHub CLI
+      - gh
       # Build essentials for development
       - build-essential
       - file