chore: deduplicate env templates into .env.example

.env.example

@@ -1,16 +1,24 @@
-# Database Configuration
-# PostgreSQL (for network database)
-DATABASE_URL=postgresql+psycopg2://punimtag:punimtag_password@localhost:5432/punimtag
+# PunimTag root environment (copy to ".env" and edit values)
 
-# Or use SQLite for local development (default if DATABASE_URL not set)
-# DATABASE_URL=sqlite:///data/punimtag.db
+# PostgreSQL (main application DB)
+DATABASE_URL=postgresql+psycopg2://punimtag:CHANGE_ME@127.0.0.1:5432/punimtag
 
-# Photo Storage
+# PostgreSQL (auth DB)
+DATABASE_URL_AUTH=postgresql+psycopg2://punimtag_auth:CHANGE_ME@127.0.0.1:5432/punimtag_auth
+
+# JWT / bootstrap admin (change these!)
+SECRET_KEY=CHANGE_ME_TO_A_LONG_RANDOM_STRING
+ADMIN_USERNAME=admin
+ADMIN_PASSWORD=CHANGE_ME
+
+# Photo storage (default for local dev: data/uploads)
 PHOTO_STORAGE_DIR=data/uploads
 
-# JWT Secrets (change in production!)
-SECRET_KEY=your-secret-key-here-change-in-production
+# Pending viewer uploads (same value as viewer UPLOAD_DIR when using that feature).
+# Web transcode cache defaults to a sibling folder: <parent>/web_videos next to
+# .../pending-photos (override with WEB_VIDEO_CACHE_DIR if needed).
+# UPLOAD_DIR=/mnt/db-server-uploads/pending-photos
+# WEB_VIDEO_CACHE_DIR=/mnt/db-server-uploads/web_videos
 
-# Single-user credentials (change in production!)
-ADMIN_USERNAME=admin
-ADMIN_PASSWORD=admin
+# Redis (RQ jobs)
+REDIS_URL=redis://127.0.0.1:6379/0