docs: add auth env vars to .env.example

.env.example

@@ -1,26 +1 @@
-# === Frambe Configuration ===
-
-# REQUIRED
-IMMICH_URL=http://your-immich-server:2283
-IMMICH_API_KEY=your-api-key-here
-
-# Slideshow
-SLIDESHOW_INTERVAL=30
-TRANSITION_DURATION=2
-IMAGE_FIT=contain
-SHUFFLE=true
-BACKGROUND_BLUR=true
-REFRESH_INTERVAL=300
-
-# Overlays
-SHOW_CLOCK=true
-SHOW_DATE=true
-SHOW_EXIF=true
-SHOW_PROGRESS=true
-
-# Auto-start (optional — or use URL params instead)
-# ALBUM_ID=
-# SHOW_FAVORITES_ONLY=false
-
-# Server (internal port — Docker maps externally via docker-compose)
-PORT=3000
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