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/.env.prod.example

@@ -0,0 +1,14 @@
+# Copy to infra/docker/.env.prod on TrueNAS or build PC (do not commit).
+# Used by compose.prod.yaml and npm run db:migrate:prod / db:restore:prod.
+
+DB_HOST=192.168.10.122
+DB_PORT=5432
+DB_USER=gallery
+DB_PASSWORD=YOUR_POSTGRES_PASSWORD
+DB_NAME=gallery_prod
+
+PORT=5173
+HOST=0.0.0.0
+PUBLIC_URL=https://gallery.mysuperlab.netcraze.pro
+TRUST_PROXY=true
+IMAGE_DIR=/app/data/images