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>

.gitignore

@@ -4,6 +4,10 @@ client/node_modules/
 .env
 .env.local
 .env.*.local
+infra/docker/.env.prod
+
+# DB backups (may contain data)
+db/DataBackup/
 
 # Recovery / temp files from local restore
 _extracted/