fix: align group private chat permission semantics

server/store/store.go

@@ -3220,13 +3220,26 @@ func (relationsMapper) CanSendP2P(tenantID types.TenantID, userID, peerID types.
 			return true, types.RelationshipFriend, nil
 		}
 	}
-	ctx, err := (relationsMapper{}).GetRelationshipContext(tenantID, userID, peerID, "")
+	tenantAdp, err := tenantBusinessAdapter(tenantID)
+	if err != nil {
+		return false, "", err
+	}
+	ctx, err := relationshipContext(tenantAdp, tenantID, userID, peerID, "")
 	if err != nil {
 		return false, "", err
 	}
 	if ctx.Relationship == types.RelationshipFriend {
 		return true, ctx.Relationship, nil
 	}
+	if ctx.Relationship == types.RelationshipNone {
+		shared, err := tenantAdp.TenantUsersShareOpenPrivateGroup(tenantID, userID, peerID)
+		if err != nil {
+			return false, ctx.Relationship, err
+		}
+		if shared {
+			return true, ctx.Relationship, nil
+		}
+	}
 	return false, ctx.Relationship, nil
 }