fix: use Docker container name for Metabase internal communication

Change Metabase URL from public domain to Docker container name
for proper internal network communication between containers.

Changes:
- Update default METABASE_URL to http://metabase:3000
- Docker DNS resolution works correctly with container names
- Maintains public domain fallback via environment variables

This fixes authentication issues when containers communicate
within the same Docker network.

nuxt4-app/server/utils/metabase.ts

@@ -5,7 +5,7 @@
  */
 
 const config = useRuntimeConfig()
-const METABASE_URL = config.metabaseUrl || 'https://metabase.nucleoriofrio.com'
+const METABASE_URL = config.metabaseUrl || 'http://metabase:3000'
 const METABASE_EMAIL = config.metabaseEmail || 'claudeCode0@nucleoriofrio.com'
 const METABASE_PASSWORD = config.metabasePassword || 'vK^NyZdZDH#p'