Add API key header support for backend authentication

gateway_client.py

@@ -4,6 +4,7 @@ from datetime import datetime
 
 
 MEMMACHINE_PORT  = os.getenv("MEMORY_SERVER_URL")
+BACKEND_API_KEY = os.getenv("BACKEND_API_KEY")
 PROMPT = """You are a helpful AI assistant. Use the provided context and profile information to answer the user's question accurately and helpfully.
 
 <CURRENT_DATE>
@@ -38,9 +39,13 @@ def ingest_and_rewrite(user_id: str, query: str) -> str:
         "user-id": user_id,
         "group-id": user_id,  
         "session-id": user_id,
-        "agent-id": "agent",  
+        "agent-id": "agent",
     }
     
+    # Add API key if configured
+    if BACKEND_API_KEY:
+        headers["x-api-key"] = BACKEND_API_KEY
+    
     requests.post(
         f"{MEMMACHINE_PORT}/v1/memories",
         json={"producer": user_id, "produced_for": "agent", "episode_content": query},
@@ -65,7 +70,12 @@ def delete_profile(user_id: str) -> bool:
         "user-id": user_id,
         "group-id": user_id,  
         "session-id": user_id,
-        "agent-id": "agent",  
+        "agent-id": "agent",
     }
+    
+    # Add API key if configured
+    if BACKEND_API_KEY:
+        headers["x-api-key"] = BACKEND_API_KEY
+    
     requests.delete(f"{MEMMACHINE_PORT}/v1/memories", headers=headers, json={})
     return True