Initial commit: modular Streamlit media viewer with Jellyfin, SSH tools, and docs

.env.example

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+JELLYFIN_URL=https://jellyfin.example.com
+JELLYFIN_API_KEY=your-api-key
+# Optional if /Users works with your API key. Otherwise set the id of the Jellyfin user whose library views should be shown.
+JELLYFIN_USER_ID=
+
+SSH_HOST=media-server.example.com
+SSH_USERNAME=username
+SSH_PORT=22
+SSH_KEY_FILENAME=/home/username/.ssh/id_rsa
+# SSH_PASSWORD=optional-password-or-key-passphrase
+REMOTE_MEDIA_ROOT=/mnt/media
+# Optional fallback prefix when REMOTE_MEDIA_ROOT mapping is not enough.
+# Example: Jellyfin gives /media/... but SSH host requires /srv/media/...
+REMOTE_PATH_PREFIX=