Remove zed from Containerfile

Zed editor removed (~357 MB savings). Can be installed separately
if needed via flatpak or other means.

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

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

Author: shanemcd

mybox/Containerfile

@@ -117,7 +117,6 @@ RUN <<EORUN
         chromium \
         qt6-qttools \
         Sunshine \
-        zed \
         \
         `# Kerberos / LDAP` \
         krb5-devel \