Refine .env.example files across all stacks

- Streamline variable organization and formatting
- Reduce redundant comments and improve clarity
- Maintain all required variables for each stack

docker-compose/alternatives/.env.example

@@ -1,17 +1,16 @@
 # Alternatives Stack Environment Variables
-# These variables are used for alternative services (Plex, Authentik, etc.)
 
-# Base Configuration
+TZ=
+PUID=
+PGID=
+SERVER_IP=
+SERVER_HOSTNAME=
 DOMAIN=
 
-# Directory Configuration
 MEDIA_DIR=
-
-# Plex Configuration
 PLEX_CLAIM=
 
-# Authentik Configuration
 AUTHENTIK_SECRET_KEY=
 AUTHENTIK_DB_NAME=
 AUTHENTIK_DB_USER=
-AUTHENTIK_DB_PASSWORD=
+AUTHENTIK_DB_PASSWORD=