feat: combo ticket 50/50 split + Best of Creation museum

- Combo tickets (matching multiple museums) split revenue/visits evenly
- Each museum gets its own row tagged with TicketType=combo, ComboWith
- Added Best of Creation (متحف خير الخلق) to museum mapping
- Holy Quraan Museum now shows 3.3M total (was 971K without combo share)
- ComboMuseums column tracks split factor for auditing

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/src/services/etlSync.ts

@@ -1,6 +1,6 @@
 import { fetchSales } from './erpClient';
 import { discoverTableIds, deleteRowsByMonth, deleteAllRows, insertRecords } from './nocodbClient';
-import { getMuseumFromProduct, getChannelLabel } from '../config/museumMapping';
+import { getMuseumsFromProduct, getChannelLabel } from '../config/museumMapping';
 import type { ERPSaleRecord, AggregatedRecord } from '../types';
 
 function generateMonthBoundaries(startYear: number, startMonth: number): Array<[string, string]> {
@@ -43,19 +43,38 @@ export function aggregateTransactions(sales: ERPSaleRecord[]): AggregatedRecord[
     const channel = getChannelLabel(sale.OperatingAreaName);
 
     for (const product of sale.Products) {
-      const museum = getMuseumFromProduct(product.ProductDescription);
-      const key = `${date}|${museum}|${channel}`;
+      const { museums, split } = getMuseumsFromProduct(product.ProductDescription);
+      const isCombo = museums.length > 1;
 
-      let entry = map.get(key);
-      if (!entry) {
-        entry = { Date: date, MuseumName: museum, Channel: channel, Visits: 0, Tickets: 0, GrossRevenue: 0, NetRevenue: 0 };
-        map.set(key, entry);
+      for (const museum of museums) {
+        const comboWith = isCombo
+          ? museums.filter(m => m !== museum).join(', ')
+          : '';
+        const ticketType = isCombo ? 'combo' : 'single';
+        const key = `${date}|${museum}|${channel}|${ticketType}`;
+
+        let entry = map.get(key);
+        if (!entry) {
+          entry = {
+            Date: date,
+            MuseumName: museum,
+            Channel: channel,
+            TicketType: ticketType,
+            ComboMuseums: museums.length,
+            ComboWith: comboWith,
+            Visits: 0,
+            Tickets: 0,
+            GrossRevenue: 0,
+            NetRevenue: 0,
+          };
+          map.set(key, entry);
+        }
+
+        entry.Visits += product.PeopleCount * split;
+        entry.Tickets += product.UnitQuantity * split;
+        entry.GrossRevenue += product.TotalPrice * split;
+        entry.NetRevenue += (product.TotalPrice - product.TaxAmount) * split;
       }
-
-      entry.Visits += product.PeopleCount;
-      entry.Tickets += product.UnitQuantity;
-      entry.GrossRevenue += product.TotalPrice;
-      entry.NetRevenue += product.TotalPrice - product.TaxAmount;
     }
   }