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

frontend/package-lock.json

@@ -1,11 +1,11 @@
 {
-  "name": "excalidraw-go-frontend",
+  "name": "excalicloud-frontend",
   "version": "0.1.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "excalidraw-go-frontend",
+      "name": "excalicloud-frontend",
       "version": "0.1.0",
       "dependencies": {
         "@excalidraw/excalidraw": "0.18.1",