slim admin backend image and remove compose config

prisma/migrations/20260714113000_add_organization_creator/migration.sql

@@ -0,0 +1,9 @@
+DO $$
+BEGIN
+  IF to_regclass('public.organizations') IS NOT NULL THEN
+    ALTER TABLE "organizations"
+      ADD COLUMN IF NOT EXISTS "created_by_id" UUID,
+      ADD COLUMN IF NOT EXISTS "created_by_name" TEXT,
+      ADD COLUMN IF NOT EXISTS "created_by_email" TEXT;
+  END IF;
+END $$;