Renomme excalidraw-go en excalicloud

Module Go github.com/vblogio/excalicloud (imports internes mis à jour),
image Docker excalicloud:local, paquet npm excalicloud-frontend,
champ source des exports .excalidraw, README et THIRD_PARTY_NOTICES.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019MgtkAhkuqFbMAuTgTDeFh

internal/storage/settings.go

@@ -15,7 +15,7 @@ import (
 	"strings"
 	"unicode/utf8"
 
-	"github.com/vblogio/excalidraw-go/internal/update"
+	"github.com/vblogio/excalicloud/internal/update"
 )
 
 // Paramètres de l'interface (titre, logo, canal d'Excalidraw) et rétention de