🐛 Describe the bug

Description
AzureOpenAIStructuredLLM in mem0/llms/azure_openai_structured.py calls self._parse_response(response, tools) on line 91 of generate_response(), but the method is never defined in the class or in LLMBase.

This causes AttributeError: 'AzureOpenAIStructuredLLM' object has no attribute '_parse_response' every time generate_response() is called.

Steps to reproduce
python
from mem0.configs.llms.azure import AzureOpenAIConfig
from mem0.llms.azure_openai_structured import AzureOpenAIStructuredLLM

config = AzureOpenAIConfig(model="gpt-4o", azure_kwargs={...})
llm = AzureOpenAIStructuredLLM(config=config)
llm.generate_response(messages=[{"role": "user", "content": "hello"}])

Expected behavior
Should return the LLM response.

Actual behavior
AttributeError: 'AzureOpenAIStructuredLLM' object has no attribute '_parse_response'

Note
AzureOpenAILLM in azure_openai.py has _parse_response defined correctly. It appears to have been missed when creating the structured variant.

Additional issue
There's also a duplicate if tools: block in generate_response() (lines 84-88)

Raise a PR #4165