feat(cctv): add NYC DOT Traffic Management Center camera pack

Register the keyless webcams.nyctmc.org catalog as a live CCTV source,
synthesize frame URLs from validated camera UUIDs, and keep the nearest
cameras to the five borough cores under the existing catalog ceiling.

src/data/dataCredits.js

@@ -247,6 +247,12 @@ export const DATA_CREDITS = [
       '<a href="https://data.norge.no/nlod/en/2.0" target="_blank" rel="noopener">Norwegian licence for Open Government data (NLOD)</a> ' +
       'distributed by Statens vegvesen',
   },
+  {
+    key: 'nyc-cctv',
+    html:
+      'CCTV cameras &amp; frames (New York City): ' +
+      '<a href="https://webcams.nyctmc.org/" target="_blank" rel="noopener">NYC DOT Traffic Management Center</a>',
+  },
   {
     key: 'gbfs',
     html: 'Bikeshare availability: GBFS operator feeds (e.g. Austin BCycle)',