Add org-scoped reusable SMS templates in the compose modal.

Users can save, pick, and delete prepared messages shared across the organization.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/prisma/migrations/20261114140000_org_sms_templates/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "Organization" ADD COLUMN "smsTemplates" JSONB NOT NULL DEFAULT '[]';