Fix excalidraw image: switch to official excalidraw/excalidraw:latest

kiliandeca/excalidraw:sha-e42a510 tag doesn't exist. The kiliandeca fork
hasn't been updated since 2021. Official image is current (Jan 2026).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -670,7 +670,7 @@ services:
 
   # Excalidraw — Collaborative whiteboard
   excalidraw:
-    image: kiliandeca/excalidraw:sha-e42a510
+    image: excalidraw/excalidraw:latest
     container_name: excalidraw-changemaker
     restart: unless-stopped
     ports:
@@ -1083,7 +1083,7 @@ services:
 
   # Docker socket proxy — read-only access for container status monitoring
   docker-socket-proxy:
-    image: tecnativa/docker-socket-proxy:0.4.2
+    image: tecnativa/docker-socket-proxy:v0.4.2
     container_name: docker-socket-proxy
     restart: unless-stopped
     environment: