T04.f: backend Festipod ActivityPods + dockerisation

- Ajoute la configuration et les services backend (app, actors, registration,
  attendees, contacts, catalog, core auth/nodeinfo/proxy/notification).
- Corrige le démarrage : désactive resourcesWithContainerPath pour éviter le
  conflit entre l'URI de l'acteur applicatif (/as/actor/app) et la route /app.
- Corrige l'URL du dépôt de shapes : https://shapes.activitypods.org/.
- Ajoute backend/Dockerfile et docker-compose.yml racine (frontend + backend).
- Met à jour .env.example racine avec les variables SEMAPPS_* et VITE_BACKEND_*.
- Gates verts : bunx tsc --noEmit (0 erreur) et bun test (50 pass).

backend/package.json

@@ -10,19 +10,24 @@
     "@rdfjs/data-model": "2.1.1",
     "@semapps/activitypub": "1.2.7",
     "@semapps/auth": "1.2.7",
-    "@semapps/crypto": "1.2.7",
     "@semapps/core": "1.2.7",
+    "@semapps/crypto": "1.2.7",
     "@semapps/importer": "1.2.7",
     "@semapps/ldp": "1.2.7",
+    "@semapps/mime-types": "1.2.7",
     "@semapps/nodeinfo": "1.2.7",
+    "@semapps/ontologies": "1.2.7",
     "@semapps/solid": "1.2.7",
+    "@semapps/sparql-endpoint": "1.2.7",
     "@semapps/triplestore": "1.2.7",
+    "@semapps/webacl": "1.2.7",
     "dotenv-flow": "^3.2.0",
     "ioredis": "^4.17.3",
     "moleculer": "^0.14.19",
     "moleculer-bull": "0.2.8",
     "moleculer-cron": "0.0.4",
     "moleculer-repl": "^0.6.6",
+    "sharp": "0.31.3",
     "url-join": "^4.0.1"
   },
   "engines": {