Add agent level progression and extend backend services.

Introduce agent level utilities/service, expand auth and notification flows, update category definitions and seed data, and wire level-aware order and suggestion handling.

prisma/seed.ts

@@ -42,6 +42,8 @@ async function main() {
   await prisma.product.deleteMany();
   await prisma.catalog.deleteMany();
   await prisma.bankAccount.deleteMany();
+  await prisma.levelBenefit.deleteMany();
+  await prisma.customerLevelDef.deleteMany();
   await prisma.customer.deleteMany();
   await prisma.company.deleteMany();
   await prisma.adminUser.deleteMany();
@@ -332,6 +334,51 @@ async function main() {
     ],
   });
 
+  await prisma.customerLevelDef.create({
+    data: {
+      code: 'bronze',
+      label: 'برنزی',
+      sortOrder: 1,
+      criteriaJson: { minSalesToman: 0 },
+      benefits: {
+        create: [{ title: 'دسترسی به کاتالوگ پایه' }],
+      },
+    },
+  });
+  await prisma.customerLevelDef.create({
+    data: {
+      code: 'silver',
+      label: 'نقره‌ای',
+      sortOrder: 2,
+      criteriaJson: { minSalesToman: 500_000_000 },
+      benefits: {
+        create: [{ title: 'پشتیبانی اولویت‌دار' }],
+      },
+    },
+  });
+  const goldLevel = await prisma.customerLevelDef.create({
+    data: {
+      code: 'gold',
+      label: 'طلایی',
+      sortOrder: 3,
+      criteriaJson: { minSalesToman: 1_500_000_000 },
+      benefits: {
+        create: [{ title: 'تخفیف ویژه سفارش‌های عمده' }],
+      },
+    },
+  });
+  await prisma.customerLevelDef.create({
+    data: {
+      code: 'vip',
+      label: 'VIP',
+      sortOrder: 4,
+      criteriaJson: { minSalesToman: 3_000_000_000 },
+      benefits: {
+        create: [{ title: 'مشاوره تخصصی و ارسال سریع' }],
+      },
+    },
+  });
+
   await prisma.customer.create({
     data: {
       id: 'agent-1',
@@ -342,10 +389,11 @@ async function main() {
       customerType: CustomerType.wholesale,
       appRole: AppUserRole.agent,
       agentCode: 'W-1247',
+      levelDefId: goldLevel.id,
       levelLabel: 'طلایی',
       nextLevelLabel: 'VIP',
-      pointsToNext: 550_000_000,
-      levelProgress: 72,
+      pointsToNext: 0,
+      levelProgress: 0,
       companyId: 'company-par',
       isActive: true,
       avatarLetter: 'ع',