feat: order revision, rial wage from variant, product tags; drop user-app-v2

Admin order edit with category chips and timeline; customer checkout charges variant rialWage; product tags; retire the unused user-app-v2 tree.

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

apps/api/prisma/migrations/20261028120000_product_tags/migration.sql

@@ -0,0 +1,2 @@
+-- Product labels from Setting `__list__tags`, assigned per product in admin.
+ALTER TABLE "Product" ADD COLUMN IF NOT EXISTS "tags" TEXT[] DEFAULT ARRAY[]::TEXT[];

apps/api/prisma/migrations/20261028140000_order_revision/migration.sql

@@ -0,0 +1,29 @@
+-- Admin order edit + customer confirm (Order.revisionStatus / OrderRevision).
+
+CREATE TYPE "OrderRevisionStatus" AS ENUM ('NONE', 'AWAITING_CUSTOMER');
+
+ALTER TABLE "Order" ADD COLUMN "revisionStatus" "OrderRevisionStatus" NOT NULL DEFAULT 'NONE';
+
+CREATE TABLE "OrderRevision" (
+    "id" TEXT NOT NULL,
+    "orderId" TEXT NOT NULL,
+    "items" JSONB NOT NULL,
+    "totalGoldWeightGrams" DECIMAL(14,4) NOT NULL,
+    "wageWeightGrams" DECIMAL(14,4) NOT NULL,
+    "flatRialCharge" DECIMAL(20,2) NOT NULL DEFAULT 0,
+    "proposedByAdminUserId" TEXT,
+    "note" TEXT,
+    "customerDecision" TEXT,
+    "customerDecidedAt" TIMESTAMP(3),
+    "appliedAt" TIMESTAMP(3),
+    "discardedAt" TIMESTAMP(3),
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "OrderRevision_pkey" PRIMARY KEY ("id")
+);
+
+CREATE INDEX "Order_revisionStatus_idx" ON "Order"("revisionStatus");
+CREATE INDEX "OrderRevision_orderId_idx" ON "OrderRevision"("orderId");
+CREATE INDEX "OrderRevision_createdAt_idx" ON "OrderRevision"("createdAt");
+
+ALTER TABLE "OrderRevision" ADD CONSTRAINT "OrderRevision_orderId_fkey" FOREIGN KEY ("orderId") REFERENCES "Order"("id") ON DELETE CASCADE ON UPDATE CASCADE;