fix(calendar): add @nestjs/throttler as explicit dependency

The package was imported but not listed in package.json, causing
Docker builds to fail since hoisted node_modules aren't available.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/calendar/apps/backend/package.json

@@ -33,6 +33,7 @@
 		"@nestjs/core": "^10.4.15",
 		"@nestjs/platform-express": "^10.4.15",
 		"@nestjs/schedule": "^4.1.2",
+		"@nestjs/throttler": "^6.2.1",
 		"class-transformer": "^0.5.1",
 		"class-validator": "^0.14.1",
 		"dotenv": "^16.4.7",
@@ -54,9 +55,9 @@
 		"@nestjs/testing": "^10.4.15",
 		"@types/express": "^5.0.0",
 		"@types/jest": "^29.5.14",
-		"@types/uuid": "^10.0.0",
 		"@types/node": "^22.10.2",
 		"@types/nodemailer": "^6.4.17",
+		"@types/uuid": "^10.0.0",
 		"@typescript-eslint/eslint-plugin": "^8.18.1",
 		"@typescript-eslint/parser": "^8.18.1",
 		"eslint": "^9.17.0",