Add native Discord boards and availability alerts

.env.example

@@ -16,6 +16,13 @@ EC_SETUP_TOKEN=
 # Game reporters send Authorization: Bearer <token> or X-EC-Telemetry-Token.
 # Telemetry ingestion is disabled until a token of at least 32 chars is set.
 EC_TELEMETRY_TOKEN=
+# Optional native Discord companion. Keep these in the controller environment;
+# enable the integration and choose published servers under Admin → Discord.
+# The application ID and public key are in the Discord Developer Portal.
+# The bot token is a secret: never put it in channel messages or screenshots.
+EC_DISCORD_APPLICATION_ID=
+EC_DISCORD_PUBLIC_KEY=
+EC_DISCORD_BOT_TOKEN=
 # Bank credentials are generated and injected automatically per native instance.
 EC_BANK_MAX_BALANCE=250000
 # Persistent SQLite metadata, game-file storage, and beta archives.