feat(bots): enable Redis SSO for todo-bot and calendar-bot

- Activate Redis session storage in both bots for cross-bot SSO
- Update SessionHelper to async methods for Redis-backed SessionService
- Fix async/await issues in todo-bot and calendar-bot matrix.service.ts
- Remove unused imports from calendar-api and todo-api services
- Add CALENDAR_BACKEND_URL and MANA_CORE_SERVICE_KEY to .env.development

Note: SessionService methods are now async (Redis-backed). Other bots
need their matrix.service.ts updated to await these async calls.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

services/mana-core-auth/src/auth/auth.module.ts

@@ -3,7 +3,9 @@ import { AuthController } from './auth.controller';
 import { BetterAuthPassthroughController } from './better-auth-passthrough.controller';
 import { OidcController } from './oidc.controller';
 import { OidcLoginController } from './oidc-login.controller';
+import { MatrixSessionController } from './matrix-session.controller';
 import { BetterAuthService } from './services/better-auth.service';
+import { MatrixSessionService } from './services/matrix-session.service';
 import { ReferralsModule } from '../referrals/referrals.module';
 
 @Module({
@@ -13,8 +15,9 @@ import { ReferralsModule } from '../referrals/referrals.module';
 		BetterAuthPassthroughController,
 		OidcController,
 		OidcLoginController,
+		MatrixSessionController,
 	],
-	providers: [BetterAuthService],
-	exports: [BetterAuthService],
+	providers: [BetterAuthService, MatrixSessionService],
+	exports: [BetterAuthService, MatrixSessionService],
 })
 export class AuthModule {}