feat(group): 1st implementation of Groups

this implements first version (manageable only by admin right now)

    routes:

        GET /api/groups
        List subject groups (paginated). Admin-only.

        POST /api/groups
        Create a new ReBAC subject group. Admin-only. The name must match the RFC 5321 local-part shape and be globally unique (case-insensitive).

        GET /api/groups/search
        Search non-virtual groups by name substring. Authenticated only (no admin role required) — backs the share-dialog recipient autocomplete.

        GET /api/groups/{id}
        Fetch a single group's details. Admin-only.

        DELETE /api/groups/{id}
        Delete a group. Cascades to `subject_group_members` (FK) and to `access_grants` rows referencing this group as a subject. Admin-only.

        PATCH /api/groups/{id}
        Update a group's metadata. Admin-only. v1 only persists name renames.

        GET /api/groups/{id}/effective-members
        List every user transitively reached through this group (members of members of members, etc.). Used by admin / audit tooling. Admin-only.

        GET /api/groups/{id}/members
        List the *direct* members of a group (one level only). Admin-only.

        POST /api/groups/{id}/members
        Add a member to a group. Exactly one of `user_id` / `group_id` must be provided. Adding a group-member runs a write-time cycle check and a nesting-depth check (max 8). Admin-only.

        DELETE /api/groups/{id}/members/group/{gid}
        Remove a nested group-member from a group. Admin-only.

        DELETE /api/groups/{id}/members/user/{uid}
        Remove a user-member from a group. Admin-only.

fix hurl

groups

round

groups

static/locales/fr.json

@@ -131,7 +131,8 @@
             "light": "Clair",
             "dark": "Sombre",
             "auto": "Comme le système"
-        }
+        },
+        "manage_groups": "Gérer les groupes"
     },
     "share": {
         "dialogTitle": "Lien de partage",
@@ -336,7 +337,13 @@
         "move_error": "Erreur lors du déplacement",
         "empty_name": "Le nom ne peut pas être vide",
         "name_exists": "Un fichier ou dossier portant ce nom existe déjà",
-        "generic_error": "Une erreur est survenue"
+        "generic_error": "Une erreur est survenue",
+        "group_name_invalid": "Le nom du groupe doit respecter le format préfixe d'email (lettres, chiffres, point, tiret, souligné ; 1–64 caractères).",
+        "group_cycle": "Ce membre créerait une référence circulaire entre groupes.",
+        "group_depth_exceeded": "Cette profondeur d'imbrication dépasse le maximum autorisé (8).",
+        "group_virtual_immutable": "Le groupe « Internal » est géré par le système et ne peut pas être modifié.",
+        "group_not_found": "Groupe introuvable.",
+        "group_name_taken": "Un groupe portant ce nom existe déjà."
     },
     "breadcrumb": {
         "home": "Accueil"
@@ -755,5 +762,31 @@
         "today": "Aujourd'hui",
         "last7days": "7 derniers jours",
         "last30days": "30 derniers jours"
+    },
+    "groups": {
+        "title": "Gérer les groupes",
+        "create_button": "Créer un groupe",
+        "create_dialog_title": "Nouveau groupe",
+        "edit_dialog_title": "Renommer le groupe",
+        "name_label": "Nom",
+        "name_placeholder": "ingenierie",
+        "description_label": "Description (facultatif)",
+        "members_section": "Membres",
+        "add_member_placeholder": "Ajouter un utilisateur ou un groupe…",
+        "no_members": "Aucun membre pour le moment.",
+        "remove_member": "Retirer",
+        "delete_group": "Supprimer le groupe",
+        "delete_confirm": "Supprimer le groupe « {name} » ? Les autorisations associées à ce groupe seront révoquées.",
+        "empty_state": "Aucun groupe pour le moment.",
+        "load_more": "Charger plus",
+        "back_to_list": "Retour",
+        "loading": "Chargement…",
+        "virtual_badge": "Système",
+        "member_count_zero": "Aucun membre",
+        "member_count_one": "1 membre",
+        "member_count_other": "{count} membres",
+        "delete_confirm_label": "Tapez le nom du groupe pour confirmer :",
+        "delete_confirm_mismatch": "Tapez le nom du groupe exactement pour confirmer.",
+        "virtual_internal_name": "Interne"
     }
 }