fix(env): Rename HOSTNAME to APP_HOSTNAME to avoid conflicts and update related configurations

.env.example

@@ -36,9 +36,10 @@ TAILSCALE_TAGS=tag:nas
 # Enable Tailscale Funnel (public access) for HTTPS? Set to 'true' or 'false'. 'false' uses Serve (Tailnet only, recommended).
 ENABLE_FUNNEL_HTTPS=false
 
-# --- Primary Hostname ---
-# Primary hostname used by Traefik for routing. Derived from Tailscale settings by default.
-HOSTNAME=${TAILSCALE_HOSTNAME}.${TAILSCALE_TAILNET_DOMAIN}
+# --- Primary Application Hostname ---
+# Primary hostname used by Traefik/Authelia. Derived from Tailscale settings by default.
+# Renamed from HOSTNAME to avoid collision with host system environment variable.
+APP_HOSTNAME=${TAILSCALE_HOSTNAME}.${TAILSCALE_TAILNET_DOMAIN}
 
 # --- Application Credentials ---
 # qBittorrent Web UI Credentials (change default!)
@@ -67,9 +68,9 @@ AUTHELIA_SESSION_SECRET= # Example: your_strong_session_secret
 AUTHELIA_STORAGE_ENCRYPTION_KEY= # Example: your_strong_storage_encryption_key
 AUTHELIA_REDIS_PASSWORD= # Example: your_strong_redis_password
 
-# Authelia Session Configuration
-AUTHELIA_SESSION_DOMAIN=${HOSTNAME}
-AUTHELIA_DEFAULT_REDIRECT_URL=https://${HOSTNAME}/home
+# Authelia Session Configuration (Note: These may be less relevant with config v4.38+ structure)
+AUTHELIA_SESSION_DOMAIN=${APP_HOSTNAME}
+AUTHELIA_DEFAULT_REDIRECT_URL=https://${APP_HOSTNAME}/home
 
 # --- API Keys & Integration Tokens (Optional - Mainly for Homepage Widgets) ---
 # Find API keys within each application's settings (usually Settings > General or Security)