feat: add MySecretariesPage and AdminSubscriptionPage (PRD completion)

- MySecretariesPage: doctor/clinic can manage their own secretaries
  with add/permissions-matrix/deactivate; uses GET /api/v1/secretaries/{doctorUuid}
- AdminSubscriptionPage: admin can create/edit plans and periods,
  view subscription sales report; tabs: پنل‌ها / گزارش فروش
- Sidebar: add منشیان link for doctor+clinic roles, add اشتراک‌ها link for admin
- App.tsx: add /my-secretaries and /admin-subscription routes

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

assets/admin/components/layout/Sidebar.tsx

@@ -21,6 +21,7 @@ import {
     UserPlusIcon,
     WrenchScrewdriverIcon,
     FolderOpenIcon,
+    IdentificationIcon,
 } from "@heroicons/react/24/outline";
 import { NavLink, useNavigate } from "react-router-dom";
 import { useAuthStore } from "../../stores/authStore";
@@ -65,6 +66,7 @@ function buildSections(primaryRole: string | null, dbUuid: string | null): Secti
                     { to: '/admin/categories', icon: TagIcon, label: 'دسته‌بندی‌ها' },
                     { to: '/admin/representations', icon: UsersIcon, label: 'نمایندگان' },
                     { to: '/admin/secretaries', icon: KeyIcon, label: 'منشی‌ها' },
+                    { to: '/admin/admin-subscription', icon: CreditCardIcon, label: 'اشتراک‌ها' },
                     { to: '/admin/settings', icon: Cog6ToothIcon, label: 'تنظیمات' },
                 ],
             },
@@ -87,6 +89,7 @@ function buildSections(primaryRole: string | null, dbUuid: string | null): Secti
                     { to: '/admin/appointments', icon: CalendarDaysIcon, label: 'نوبت‌ها' },
                     { to: '/admin/my-patients', icon: FolderOpenIcon, label: 'پرونده بیماران' },
                     { to: '/admin/staff', icon: UserPlusIcon, label: 'پرسنل' },
+                    { to: '/admin/my-secretaries', icon: IdentificationIcon, label: 'منشیان' },
                     { to: '/admin/clinic-services', icon: WrenchScrewdriverIcon, label: 'سرویس‌ها' },
                     { to: '/admin/sms-wallet', icon: DevicePhoneMobileIcon, label: 'کیف پول پیامک' },
                 ],
@@ -120,6 +123,7 @@ function buildSections(primaryRole: string | null, dbUuid: string | null): Secti
                     { to: '/admin/appointments', icon: CalendarDaysIcon, label: 'نوبت‌های من' },
                     { to: '/admin/my-patients', icon: FolderOpenIcon, label: 'پرونده بیماران' },
                     { to: '/admin/staff', icon: UserPlusIcon, label: 'پرسنل' },
+                    { to: '/admin/my-secretaries', icon: IdentificationIcon, label: 'منشیان' },
                     { to: '/admin/clinic-services', icon: WrenchScrewdriverIcon, label: 'سرویس‌ها' },
                     { to: '/admin/sms-wallet', icon: DevicePhoneMobileIcon, label: 'کیف پول پیامک' },
                 ],