feat: v1.0 — am registry : registre communautaire de catalogues (publication + recherche sur Gitea), manifeste source/version/auteur/sha256, installation avec validation du checksum et décision de confiance explicite (closes #77)

- src/registry.rs : Manifest (schema/name/version/author/source/agents_count/sha256), publish (écrit am-manifest.json + instructions git), search (multi-sources via settings.registry.sources), install (manifeste → catalogue → sha256 → source cohérente → confiance → register_include), list
- settings.registry {sources, author} + doc config.yaml ; CLI/REPL/help/man/i18n
- 11 tests : hash, manifest_url, publish (fichier + refus catalogue vide/sans source), E2E install tiny_http (refus sans confiance, enregistrement avec --yes, 4 requêtes), source mismatch

src/i18n.rs

@@ -164,6 +164,9 @@ pub const CATALOG: &[(&str, &str)] = &[
     ("exécuter ces commandes ?", "run these commands?"),
     ("annulé", "cancelled"),
     ("usage: ask <demande> — ex: ask installe claude et lance-le", "usage: ask <request> — e.g. ask installe claude et lance-le"),
+    ("aucune source enregistrée — settings.registry.sources ou: am registry install <url>", "no sources registered — settings.registry.sources or: am registry install <url>"),
+    ("installation refusée — source non fiable", "installation refused — untrusted source"),
+    ("usage: registry publish <catalogue.yaml> --source <url> | registry search <mot> | registry install <url> | registry list", "usage: registry publish <catalog.yaml> --source <url> | registry search <query> | registry install <url> | registry list"),
     ("usage: suggest <requête> — ex: suggest un agent pour du Python", "usage: suggest <query> — e.g. suggest un agent pour du Python"),
     // ---- providers (#88) ---------------------------------------------------
     ("aucun provider enregistré — voir: am providers add <nom> --base-url <url>", "no providers registered — see: am providers add <name> --base-url <url>"),