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

schema.graphqls

@@ -6,6 +6,7 @@ scalar DateTime
 type System {
   id: ID!
   name: String!
+  initialRegion: Region
   routes: [Route!]
   route(id: ID): Route
   stops: [Stop!]
@@ -16,6 +17,13 @@ type System {
   parkingSystem: ParkingSystem
 }
 
+type Region {
+  latitude: Float!
+  longitude: Float!
+  latitudeDelta: Float!
+  longitudeDelta: Float!
+}
+
 type ParkingSystem {
   systemId: ID!
   parkingStructures: [ParkingStructure!]