build: drop admin2/api zip-stash from server-install; install via GPM (option B)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Np4cMQLF77i664CAQXySzU

scripts/server-install.sh

@@ -22,8 +22,6 @@ cd "$WEBROOT"
 wget --no-verbose "https://github.com/getgrav/grav/releases/download/${GRAV_VERSION}/grav-admin-v${GRAV_VERSION}.zip" -O grav-admin.zip
 unzip -oq grav-admin.zip
 cp -rf grav-admin/. .
-cp -rf grav-admin/user/plugins/admin2 /tmp/admin2-plugin
-cp -rf grav-admin/user/plugins/api /tmp/api-plugin
 rm -rf grav-admin grav-admin.zip
 
 echo "==> Cloning user repo"
@@ -40,9 +38,6 @@ fi
 
 echo "==> Creating required directories"
 mkdir -p user/plugins user/accounts user/data
-cp -rf /tmp/admin2-plugin user/plugins/admin2
-cp -rf /tmp/api-plugin user/plugins/api
-rm -rf /tmp/admin2-plugin /tmp/api-plugin
 
 echo "==> Installing plugins"
 php bin/gpm install $PLUGINS -y