config: make OpenClaw credentials optional when LLM_BACKEND=claude

Allows removing all GATEWAY_*, VOICE_MODEL, *_SESSION_KEY env vars
when running on the Claude direct backend. The OpenClaw hard-exit
check now only fires when that backend is actually selected.

satellite/modes.py

@@ -75,7 +75,10 @@ def _conversation_loop(agent_id: str, agent_name: str = "Cosmo"):
 
 def run_with_enter():
     print("\n🦞 Cosmo Satellite запущен (режим: Enter для активации)")
-    print(f"   Gateway : {GATEWAY_URL}")
+    if LLM_BACKEND == "claude":
+        print(f"   LLM     : Claude (direct)")
+    else:
+        print(f"   Gateway : {GATEWAY_URL}")
     print("\nНажми Enter → говори → получи ответ. Ctrl+C для выхода.\n")
 
     while True: