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.

server/providers/cctv/catalog.js

@@ -19,6 +19,7 @@ import {
   loadCalgarySourcesFromOpenData,
   loadDelDOTSourcesFromOpenData,
   loadVegvesenSourcesFromOpenData,
+  loadNycSourcesFromOpenData,
 } from './sources.js';
 
 /** Env kill switch: unset or anything but "0" means enabled. */
@@ -98,6 +99,11 @@ const LIVE_PACKS = [
     enabled: () => envEnabled('CCTV_VEGVESEN_ENABLED'),
     load: loadVegvesenSourcesFromOpenData,
   },
+  {
+    name: 'nyc',
+    enabled: () => envEnabled('CCTV_NYC_ENABLED'),
+    load: loadNycSourcesFromOpenData,
+  },
 ];
 /**
  * Load CCTV sources from a local JSON file (CCTV_SOURCES_FILE env or default).