fix: rename loop variable to avoid shadowing Memory object

Fixes #449

The loop variable 'memory' in the memory iteration was shadowing the
Memory object from mem0, causing 'AttributeError: dict object has no
attribute add' when memory.add() was called later.

Renamed to 'mem' to match the pattern already used in other parts of
the codebase.

Affected files:
- ai_travel_agent_memory/travel_agent_memory.py
- multi_llm_memory/multi_llm_memory.py

advanced_llm_apps/llm_apps_with_memory_tutorials/ai_travel_agent_memory/travel_agent_memory.py

@@ -70,9 +70,9 @@ if openai_api_key:
         relevant_memories = memory.search(query=prompt, user_id=user_id)
         context = "Relevant past information:\n"
         if relevant_memories and "results" in relevant_memories:
-            for memory in relevant_memories["results"]:
-                if "memory" in memory:
-                    context += f"- {memory['memory']}\n"
+            for mem in relevant_memories["results"]:
+                if "memory" in mem:
+                    context += f"- {mem['memory']}\n"
 
         # Prepare the full prompt
         full_prompt = f"{context}\nHuman: {prompt}\nAI:"

advanced_llm_apps/llm_apps_with_memory_tutorials/multi_llm_memory/multi_llm_memory.py

@@ -51,9 +51,9 @@ if openai_api_key and anthropic_api_key:
             relevant_memories = memory.search(query=prompt, user_id=user_id)
             context = "Relevant past information:\n"
             if relevant_memories and "results" in relevant_memories:
-                for memory in relevant_memories["results"]:
-                    if "memory" in memory:
-                        context += f"- {memory['memory']}\n"
+                for mem in relevant_memories["results"]:
+                    if "memory" in mem:
+                        context += f"- {mem['memory']}\n"
                 
             full_prompt = f"{context}\nHuman: {prompt}\nAI:"