chore: clean up dependencies and fix Ollama auth

- Remove unused packages: praw, feedparser, eodhd, akshare, tushare, finnhub
- Fix Ollama requiring API key

tradingagents/llm_clients/openai_client.py

@@ -57,6 +57,7 @@ class OpenAIClient(BaseLLMClient):
                 llm_kwargs["api_key"] = api_key
         elif self.provider == "ollama":
             llm_kwargs["base_url"] = "http://localhost:11434/v1"
+            llm_kwargs["api_key"] = "ollama"  # Ollama doesn't require auth
         elif self.base_url:
             llm_kwargs["base_url"] = self.base_url