catrelease: the CAT item introduction-release table (release guard, stage 1)

The table behind the release-aware command/parameter filter: which proactive
command, event, data object and PLI qualifier appeared in which release,
seeded from the curated reference in the workspace
docs/uicc/ETSI-3GPP-Releases.md (3GPP TS 31.111 Annex W, ETSI TS 102 223
Annex V, ETSI TS 101 220 Annex Q; the version major is the release).

- pysim_simple_server/catrelease.py: CAT_RELEASE (events/commands/objects/pli),
  release_label() - everything below Rel-6 collapses to "pre-Rel-6" - and
  item_release(); an item absent from the table is one the histories do not
  pin down and is never filtered.
- The PWA mirrors it as CAT_RELEASE + catReleaseLabel() next to the other
  release table (ETSI_TOOLKIT_RELEASE); no behaviour change yet - stage 2
  (the card-release selector and REL-x badges) and stage 3 (the filtering of
  the event list, PLI and push builders) consume it.
- Drift guards: tests/test_catrelease.py (module <-> PWA mirror, event-list
  coverage through 0x1F minus the Void 0x1A, helper vectors) and
  frontend/tests/cat_release.test.js (the PWA side).
- sw cache simple-v360.

frontend/sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'simple-v359';
+const CACHE = 'simple-v360';
 const URLS = [
   'index.html',
   'help.html',