Document Bike Itaú (Tembici) and test the Brazilian cities

The seven feeds publish no licence, operator or attribution fields, so DATA_SOURCES records that and credits the operator. Adds a registry test per city: allowed host and path, provider, and activation over its outermost live station.

src/data/dataCredits.js

@@ -304,7 +304,7 @@ export const DATA_CREDITS = [
     key: 'gbfs',
     html:
       'Bikeshare availability: GBFS operator feeds ' +
-      '(e.g. Austin BCycle; Bike Share Toronto, operated by the Toronto Parking Authority; Bike Itaú/Tembici)',
+      '(e.g. Austin BCycle; Bike Share Toronto, operated by the Toronto Parking Authority; Bike Itaú, operated by Tembici)',
   },
   {
     key: 'urbansharing-gbfs',