Replace the App-identity !gh text command with native slash and message
context-menu commands. /gh login|logout link a Discord user to their GitHub
account; /gh comment add|edit|del and the right-click 'GitHub' commands open
a modal and create/edit/delete comments using the user's own OAuth token,
delegating permission checks to GitHub (surfacing 401/403/404). The gateway
registers guild commands on connect and handles interactions in the DO.
Add an admin WebUI (Nuxt static SPA in admin/, served via the ASSETS
binding) for managing routes and viewing send logs. Access is gated by
GitHub OAuth plus an ADMIN_USER_IDS whitelist with cookie sessions
(admin-session.ts). Expose routes/logs CRUD API (admin-routes.ts), add a
discord-link mapping in token-store.ts, and mount admin routes with an
SPA assets fallback in the server.
Gateway is now an opt-in feature (DISCORD_GATEWAY_ENABLED); when disabled,
messages are delivered via the Discord REST API (discord-rest.ts) instead of
the Durable Object. Record per-route delivery results (send-log.ts) for the
WebUI. Configure assets binding, DO sqlite migration and cron trigger.
Remove hardcoded DEFAULT_ROUTES and Config.discord.defaultChannelId so
forwarding is driven entirely by user-defined routes (empty KV = no
forwarding). Add ADMIN_USER_IDS, DISCORD_GATEWAY_ENABLED and ASSETS to Env.
