feat(server-setup): replace nginx with caddy

Assisted-by: GLM 5.3 Flash

tests/server-setup.pl

@@ -124,6 +124,25 @@ my %defaults = parse_args();
 is($defaults{dry_run}, 0, 'args: dry run is off by default');
 @ARGV = @saved;
 
+# ---------------------------------------------------------------------------
+# The base package catalogue
+# ---------------------------------------------------------------------------
+
+# The proxy of the collection is caddy everywhere; nginx left the baseline when
+# sglang-deploy.pl moved to Caddy, and the name survives only in its own legacy
+# clean-up.
+check((grep { $_ eq 'caddy' } base_packages()) == 1, 'packages: caddy is a base package');
+check((grep { $_ eq 'nginx' } base_packages()) == 0, 'packages: nginx is not');
+is(join('|', base_packages()),
+   'nano|curl|wget|htop|tmux|rsync|caddy|openssl|jq|fastfetch',
+   'packages: the whole list, in order');
+my %openeuler_gaps = unpackaged_for('openeuler');
+is(exists $openeuler_gaps{caddy} ? 'yes' : 'no', 'yes',
+   'packages: the openEuler gap is named in the unpackaged map');
+is(scalar(unpackaged_for('fedora')) // 0, 0, 'packages: Fedora has no unpackaged entry');
+is(scalar(unpackaged_for('centos')) // 0, 0,
+   'packages: CentOS Stream has no unpackaged entry, EPEL carries caddy');
+
 # ---------------------------------------------------------------------------
 # The command runner
 # ---------------------------------------------------------------------------