feat: lives PeerTube/Rumble, page Admin, TTL par provider, import/export playlists

#1 Live
- PeerTube: API native ?isLive=true (recherche sepiasearch + videos de chaine),
  mapPeertubeItem exporte la regle live (type/kind/isLive, viewers, jamais de
  duree), caps pt live:true, themes « En direct » branches pt/ru
- Rumble: mode 'live' de scrapeRumbleList (rumble.com/browse/live, SSR), items
  type:live + extraction channelId (/c/<slug>), route GET /api/rumble/live,
  onglet chaine live filtre par channelId (plafond page 1 = 50 directs)
- Odysee: N/A prouve (proxy na-backend sous jeton, probe 2026-10), caps inchangees
- Tests: npm run test:live (25 assertions), assertion adapter_contract mise a
  jour (seuls tw/pt/ru declarent live)

#2 Playlists natives
- Twitch: NON FAISABLE — probe avec token app valide: GET/POST /helix/playlists
  et /helix/playlists/{id}/videos -> 404 (controle /helix/users -> 400).
  Matrice README: Twitch/Odysee/Rumble en N/A avec preuves

#3 Quick wins
- Page Administration /#/admin (entree sidebar Informations + i18n nav.admin
  FR/EN): healthz + providers/metrics rendus (statut, yt-dlp, clés actives/
  bannies, anti-ban, cache par provider, compteurs 1h, quota du jour) ;
  healthz sert aussi sous /proxy/api/healthz
- TTL par provider: server/env-ttl.mjs (<BASE>_<P> -> <BASE> -> defaut, jamais
  nul), branche sur les caches details et transcripts ; suggest reste global
  (cle agregee multi-providers) ; tests npm run test:cache
- Import/Export playlists JSON: GET /playlists/export (newtube-playlists-v1,
  avant /playlists/:id) + POST /playlists/import (dedoublonnage par titre),
  boutons [Exporter] [Importer] sur la page listes de lecture

README: matrice fournisseurs (Live pt/ru OK, od N/A, playlists N/A prouves),
roadmap deplace en ✅ (Live, import/export, Admin, TTL) + 🟡 mis a jour.

package.json

@@ -27,8 +27,9 @@
     "fixtures:record": "node ./server/tests/record_provider_shapes.mjs",
     "doc:providers": "node ./server/tests/generate-provider-doc.mjs",
     "test:rumble": "node ./server/tests/rumble-ld.test.mjs",
+    "test:live": "node ./server/tests/live_providers.test.mjs",
     "test:odysee": "node ./server/tests/odysee-resolve.test.mjs",
-    "test:cache": "node ./server/tests/search-cache.test.mjs",
+    "test:cache": "node ./server/tests/search-cache.test.mjs && node ./server/tests/env_ttl.test.mjs",
     "test:videos": "node ./server/tests/videos_catalog.test.mjs",
     "test:channelref": "node ./server/tests/channel_ref.test.mjs",
     "test:flags": "node --test ./server/tests/contract_version.test.mjs ./server/tests/feature_flags_http.test.mjs",