fix: support image drop and paste in terminal

Allow drag/drop and clipboard image paste in the dashboard terminal so users can quickly upload images into the active shell session, with a visible hint for discoverability.

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

dashboard/docker-compose.yml

@@ -44,6 +44,7 @@ services:
       - TELEGRAM_PROXY=${TELEGRAM_PROXY:-}
       - CORS_ORIGINS=https://nas.jimmygan.com
       - LITELLM_HEALTH_API_KEY=${LITELLM_HEALTH_API_KEY:-}
+      - LITELLM_URL=http://litellm:4005
     volumes:
       - /volume1:/volume1
       - /volume1/docker/nas-dashboard/ssh/dashboard_terminal:/app/ssh/id_ed25519:ro
@@ -62,6 +63,7 @@ services:
     networks:
       - internal
       - gitea_gitea
+      - nas-dashboard_internal
     depends_on:
       - docker-socket-proxy
     logging:
@@ -74,3 +76,5 @@ networks:
   internal:
   gitea_gitea:
     external: true
+  nas-dashboard_internal:
+    external: true