fix(cctv): make the Lithuania pack opt-in until its licence is confirmed

The camera endpoints are the eismoinfo.lt website backend, which the Via
Lietuva open-data statement does not list, so the pack now follows the NYC
opt-in pattern (CCTV_LITHUANIA_ENABLED=1) and the docs say why. A failed
catalog request now aborts its sibling instead of leaving it open until the
timeout, and a redirect is logged as not followed.

server/providers/cctv/catalog.js

@@ -26,15 +26,18 @@ import {
 /** Env kill switch: unset or anything but "0" means enabled. */
 const envEnabled = (name) => String(process.env[name] || '1').trim() !== '0';
 /** Env opt-in: only "1" enables. For packs whose feed access needs an
- * operator agreement, so an unset flag never reaches the upstream. */
+ * operator agreement or whose terms are unconfirmed, so an unset flag never
+ * reaches the upstream. */
 const envOptIn = (name) => String(process.env[name] || '').trim() === '1';
 
 /**
  * Live open-data packs, in merge order. Adding a region is one entry here
- * plus its loader in sources.js; the catalog cap is shared across entries
- * round-robin (cap.js), so a new pack never silently evicts an older one.
+ * plus its loader (in sources.js or its own module); the catalog cap is
+ * shared across entries round-robin (cap.js), so a new pack never silently
+ * evicts an older one.
  * Each pack fails independently (allSettled) and is gated by its own env
- * kill switch, or by an opt-in flag where access needs an agreement.
+ * kill switch, or by an opt-in flag where access needs an agreement or the
+ * terms are unconfirmed.
  */
 const LIVE_PACKS = [
   { name: 'austin', enabled: () => true, load: loadAustinSourcesFromOpenData },
@@ -111,8 +114,10 @@ const LIVE_PACKS = [
     load: loadNycSourcesFromOpenData,
   },
   {
+    // Opt-in until the Via Lietuva open-data terms are confirmed to cover the
+    // camera photos (see DATA_SOURCES.md).
     name: 'lithuania',
-    enabled: () => envEnabled('CCTV_LITHUANIA_ENABLED'),
+    enabled: () => envOptIn('CCTV_LITHUANIA_ENABLED'),
     load: loadLithuaniaSources,
   },
 ];