Add initial region loading for supported systems

Expose an initialRegion field on the System GraphQL type so the app can
display the correct campus area on first load instead of a zoomed-out
default map view. Chapman University is configured with coordinates
centered on campus.

https://claude.ai/code/session_0162emnCi1KxW5FkTNn2ZrvH

src/index.ts

@@ -25,6 +25,12 @@ const supportedSystems: InterchangeSystemBuilderArguments[] = [
     name: "Chapman University",
     useSelfUpdatingEtas: true,
     shuttleStopArrivalDegreeDelta: 0.001,
+    initialRegion: {
+      latitude: 33.7937,
+      longitude: -117.8531,
+      latitudeDelta: 0.01,
+      longitudeDelta: 0.01,
+    },
   }
 ]