chore: some refactor and cleaning

.env.example

@@ -1,12 +1,13 @@
 ADMIN_EMAIL=""
+ANTHROPIC_API_KEY=""
 CRON_SECRET=""
 HOME_URL=""
-MAINTENANCE_MODE=""
-NEWS_LIMIT=""
+MAINTENANCE_MODE="0"
+NEWS_LIMIT="50"
+NEWS_TO_USE="10"
 NEXT_PUBLIC_BRAND_COUNTRY=""
 NEXT_PUBLIC_BRAND_EMAIL=""
 NEXT_PUBLIC_BRAND_NAME=""
-NX_DAEMON=""
 POSTGRES_DATABASE=""
 POSTGRES_HOST=""
 POSTGRES_PASSWORD=""
@@ -14,26 +15,11 @@ POSTGRES_PRISMA_URL=""
 POSTGRES_URL=""
 POSTGRES_URL_NON_POOLING=""
 POSTGRES_USER=""
-RESEND_AUDIENCE=""
 RESEND_FROM=""
 RESEND_KEY=""
 SECRET_HASH=""
-TURBO_REMOTE_ONLY=""
-TURBO_RUN_SUMMARY=""
-VERCEL="1"
-VERCEL_ENV="development"
-VERCEL_GIT_COMMIT_AUTHOR_LOGIN=""
-VERCEL_GIT_COMMIT_AUTHOR_NAME=""
-VERCEL_GIT_COMMIT_MESSAGE=""
-VERCEL_GIT_COMMIT_REF=""
-VERCEL_GIT_COMMIT_SHA=""
-VERCEL_GIT_PREVIOUS_SHA=""
-VERCEL_GIT_PROVIDER=""
-VERCEL_GIT_PULL_REQUEST_ID=""
-VERCEL_GIT_REPO_ID=""
-VERCEL_GIT_REPO_OWNER=""
-VERCEL_GIT_REPO_SLUG=""
-VERCEL_URL=""
-ANALYZE="false"
-ANTHROPIC_API_KEY=""
-NEWS_TO_USE=10
+SMTP_FROM=""
+SMTP_HOST=""
+SMTP_PASSWORD=""
+SMTP_PORT=""
+SMTP_USER=""