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>

infra/docker/truenas-setup.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+# Run on TrueNAS shell once before first deploy.
+set -euo pipefail
+
+IMAGE_ROOT="/mnt/BasePool/Applications/Gallery/data/images"
+
+mkdir -p "${IMAGE_ROOT}/portraits" "${IMAGE_ROOT}/paintings/thumbs"
+chown -R 1001:1001 "/mnt/BasePool/Applications/Gallery"
+chmod -R u+rwX,g+rwX "/mnt/BasePool/Applications/Gallery"
+
+echo "Created ${IMAGE_ROOT} (owner uid 1001 = gallery user in container)"