Move Foldergram media dir; add batch CT creator

Change Foldergram installation to store media and config under /opt/foldergram_media (create media dir, write env file there, update systemd EnvironmentFile). Update ct/foldergram.sh to remove temporary backup/restore during updates. Update json/foldergram.json config_path and add an info note about where to place media. Add tools/pve/ct-batch-create.sh — a new Proxmox CT batch-creator script (interactive/unattended modes, caching, storage selection) to download and deploy multiple community-scripts CTs.

install/foldergram-install.sh

@@ -27,9 +27,18 @@ $STD corepack enable
 cd /opt/foldergram
 $STD pnpm install
 $STD pnpm run build
-cat <<EOF >/opt/foldergram/foldergram.env
+mkdir -p /opt/foldergram_media
+cat <<EOF >/opt/foldergram_media/foldergram.env
 NODE_ENV=production
 SERVER_PORT=4141
+DATA_ROOT=/opt/foldergram_media
+GALLERY_ROOT=/opt/foldergram_media/gallery
+DB_DIR=/opt/foldergram_media/db
+THUMBNAILS_DIR=/opt/foldergram_media/thumbnails
+PREVIEWS_DIR=/opt/foldergram_media/previews
+IMAGE_DETAIL_SOURCE=preview
+DERIVATIVE_MODE=eager
+GALLERY_EXCLUDED_FOLDERS=
 EOF
 msg_ok "Configured Foldergram"
 
@@ -43,7 +52,7 @@ After=network.target
 WorkingDirectory=/opt/foldergram
 ExecStart=/usr/bin/pnpm start
 Restart=always
-EnvironmentFile=/opt/foldergram/foldergram.env
+EnvironmentFile=/opt/foldergram_media/foldergram.env
 
 [Install]
 WantedBy=multi-user.target