feat(share): add Share Collection cashier flow and fix Share Product accounting

- Add Share Collection screen under Cashier menu for cash pre-collection
  before share account activation; posts Dr Cash Vault, Cr Share Sundry,
  Cr Income GL entries with duplicate-collection guard
- Restore all 4 GL mappings (Assets, Liabilities, Income, Equity) in Share
  Product accounting step with pill-style savings-product UI
- Remove Multiples section from Share Product currency step; default
  Decimal Places to 2
- GET /cashier/sharecollection/:id endpoint for collection status check

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

src/app/cashier/cashier-routing.module.ts

@@ -20,6 +20,7 @@ import { ReconciliationComponent } from './reconciliation/reconciliation.compone
 import { CashHistoryComponent } from './cash-history/cash-history.component';
 import { ClosingCashReportComponent } from './closing-cash-report/closing-cash-report.component';
 import { ExcessTransactionReportComponent } from './excess-transaction-report/excess-transaction-report.component';
+import { ShareCollectionComponent } from './share-collection/share-collection.component';
 
 const routes: Routes = [
   Route.withShell([
@@ -76,6 +77,11 @@ const routes: Routes = [
           path: 'excess-report',
           component: ExcessTransactionReportComponent,
           data: { title: 'Excess Transaction Report', breadcrumb: 'Excess Transaction Report' }
+        },
+        {
+          path: 'share-collection',
+          component: ShareCollectionComponent,
+          data: { title: 'Share Collection', breadcrumb: 'Share Collection' }
         }
       ]
     }