feat: add quick payment action and improve copy button UX

Mini App Home Screen:
- Add 'Record Payment' button to utilities and rent period cards
- Pre-fill payment amount with member's share (rentShare/utilityShare)
- Modal dialog with amount input and currency display
- Toast notifications for copy and payment success/failure feedback

Copy Button Improvements:
- Increase spacing between icon and text (4px → 8px)
- Add hover background and padding for better touch target
- Green background highlight when copied (in addition to icon color change)
- Toast notification appears when copying any value

Backend:
- Add /api/miniapp/payments/add endpoint for quick payments
- Payment notifications sent to 'reminders' topic in Telegram
- Include member name, payment type, amount, and period in notification

Files:
- New: apps/miniapp/src/components/ui/toast.tsx
- Modified: apps/miniapp/src/routes/home.tsx, apps/miniapp/src/index.css,
  apps/miniapp/src/theme.css, apps/miniapp/src/i18n.ts,
  apps/bot/src/miniapp-billing.ts, apps/bot/src/server.ts

Quality Gates: ✅ format, lint, typecheck, build, test

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

apps/miniapp/src/demo/miniapp-demo.ts

@@ -27,9 +27,21 @@ export const demoDashboard: MiniAppDashboard = {
   period: '2026-03',
   currency: 'GEL',
   timezone: 'Asia/Tbilisi',
+  rentWarningDay: 17,
   rentDueDay: 20,
+  utilitiesReminderDay: 3,
   utilitiesDueDay: 4,
   paymentBalanceAdjustmentPolicy: 'utilities',
+  rentPaymentDestinations: [
+    {
+      label: 'TBC card',
+      recipientName: 'Landlord',
+      bankName: 'TBC Bank',
+      account: '1234 5678 9012 3456',
+      note: null,
+      link: null
+    }
+  ],
   totalDueMajor: '2410.00',
   totalPaidMajor: '650.00',
   totalRemainingMajor: '1760.00',
@@ -209,7 +221,8 @@ export const demoAdminSettings: MiniAppAdminSettingsPayload = {
     rentWarningDay: 17,
     utilitiesDueDay: 4,
     utilitiesReminderDay: 3,
-    timezone: 'Asia/Tbilisi'
+    timezone: 'Asia/Tbilisi',
+    rentPaymentDestinations: demoDashboard.rentPaymentDestinations
   },
   assistantConfig: {
     householdId: 'demo-household',