mcp-manager: reference ${ANTHROPIC_API_KEY} in compose so user-config key reaches the container

apps/mcp-manager/docker-compose.json

@@ -22,6 +22,7 @@
         { "key": "FRONTEND_URL", "value": "${APP_PROTOCOL}://${APP_DOMAIN}" },
         { "key": "AGENT_PROVIDER", "value": "anthropic" },
         { "key": "ANTHROPIC_MODEL", "value": "claude-sonnet-4-6" },
+        { "key": "ANTHROPIC_API_KEY", "value": "${ANTHROPIC_API_KEY}" },
         { "key": "OLLAMA_BASE_URL", "value": "http://192.168.0.32:11434/v1" },
         { "key": "OLLAMA_MODEL", "value": "gemma4:26b-tuned" },
         { "key": "OLLAMA_API_KEY", "value": "ollama" },