Add SMS OTP auth, discounts, customer orders, and category slugs.

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

prisma/migrations/20260804100000_category_slug/migration.sql

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+-- AlterTable
+ALTER TABLE "Category" ADD COLUMN "slug" TEXT;
+
+-- Backfill from nameEn (latin slug). Keep unique with id suffix on collision.
+UPDATE "Category" AS c
+SET "slug" = lower(
+  regexp_replace(
+    regexp_replace(trim(c."nameEn"), '[^a-zA-Z0-9]+', '-', 'g'),
+    '(^-+|-+$)',
+    '',
+    'g'
+  )
+);
+
+UPDATE "Category"
+SET "slug" = 'category'
+WHERE "slug" IS NULL OR "slug" = '';
+
+UPDATE "Category" AS c
+SET "slug" = c."slug" || '-' || right(c."id", 4)
+WHERE c."id" IN (
+  SELECT id FROM (
+    SELECT id, ROW_NUMBER() OVER (PARTITION BY slug ORDER BY "createdAt", id) AS rn
+    FROM "Category"
+  ) d
+  WHERE rn > 1
+);
+
+ALTER TABLE "Category" ALTER COLUMN "slug" SET NOT NULL;
+
+-- Prefer readable Persian-romanized top-level slugs
+UPDATE "Category" SET "slug" = 'shirini' WHERE "nameFa" = 'شیرینی' AND "parentId" IS NULL;
+UPDATE "Category" SET "slug" = 'cake' WHERE "nameFa" = 'کیک' AND "parentId" IS NULL;
+UPDATE "Category" SET "slug" = 'shirini-tar' WHERE "nameFa" = 'شیرینی تر';
+UPDATE "Category" SET "slug" = 'shirini-khoshk' WHERE "nameFa" = 'شیرینی خشک';
+UPDATE "Category" SET "slug" = 'cream-cake' WHERE "nameFa" = 'کیک خامه';
+
+CREATE UNIQUE INDEX "Category_slug_key" ON "Category"("slug");