fix: add rate limits

Former-commit-id: 17104be95d3df1046fe4508b8b3cc542715f8954 [formerly 0a5f0e891540c3094cde4db5b43e8689692374e8]
Former-commit-id: 31247b9871a8d0f3ebf882a1e6cf3338634685bf

planning_ai/llms/llm.py

@@ -1,8 +1,11 @@
 from dotenv import load_dotenv
+from langchain_core.rate_limiters import InMemoryRateLimiter
 from langchain_openai import ChatOpenAI
 
+rate_limiter = InMemoryRateLimiter(requests_per_second=1)
+
 load_dotenv()
 
 
-GPT4o = ChatOpenAI(temperature=0, model="gpt-4o-mini")
-O3Mini = ChatOpenAI(model="o3-mini")
+GPT4o = ChatOpenAI(temperature=0, model="gpt-4o-mini", rate_limiter=rate_limiter)
+O3Mini = ChatOpenAI(model="o3-mini", rate_limiter=rate_limiter)