feat: introduce web dashboard with multi-bot management

- add Discord OAuth2 authentication
- allow users to register their bots via token
- implement dynamic bot start/stop system
- store bots in database (multi-tenant)
- replace single-bot env setup with scalable architecture

.gitignore

@@ -1,5 +1,11 @@
 node_modules/
 build/
+dist/
+.next/
+apps/*/dist/
+apps/*/.next/
+packages/*/dist/
+*.tsbuildinfo
 .env
 .env.*
 !.env.example