Add dev/prod environments with TrueNAS Docker production deploy.

Split PostgreSQL into gallery_dev and gallery_prod, add Docker/Gitea deploy tooling,
SMB image sync, pgAdmin split script, dev:web on Keenetic :5173, and operator docs.

Co-authored-by: Cursor <cursoragent@cursor.com>

deploy/gallery.service

@@ -1,4 +1,5 @@
-# systemd unit — adjust User, WorkingDirectory, and EnvironmentFile paths.
+# LEGACY — superseded by TrueNAS Docker prod (https://gallery.mysuperlab.netcraze.pro:5173).
+# systemd unit for running Node directly on a Linux host — not used in current homelab setup.
 # Install:
 #   sudo cp deploy/gallery.service /etc/systemd/system/gallery.service
 #   sudo systemctl daemon-reload