Fix config: use agents.defaults (plural) instead of agent

- Change agent.model to agents.defaults.model
- Remove unknown 'connect' key
- Use correct OpenClaw config format

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Dockerfile

@@ -24,15 +24,10 @@ if [ ! -f /root/.openclaw/openclaw.json ]; then\n\
   "gateway": {\n\
     "port": 7860\n\
   },\n\
-  "agent": {\n\
-    "model": {\n\
-      "id": "anthropic/claude-sonnet-4-20250514"\n\
-    }\n\
-  },\n\
-  "connect": {\n\
-    "params": {\n\
-      "auth": {\n\
-        "mode": "none"\n\
+  "agents": {\n\
+    "defaults": {\n\
+      "model": {\n\
+        "id": "anthropic/claude-sonnet-4-20250514"\n\
       }\n\
     }\n\
   }\n\