Langchain fixes and env support #54
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- Replace deprecated langchain imports with langchain-community - Update ChatOpenAI import to langchain_community.chat_models - Update get_openai_callback import to langchain_community.callbacks - Add python-dotenv for .env file support - Make API keys optional at import time (only required when using specific models) - OPENAI_API_KEY only required for OpenAI models (default) - GOOGLE_API_KEY only required when using 'gemini' model - Add clear error messages when required API keys are missing - Update requirements.txt to include langchain-community and python-dotenv
- Upgrade pandas from 2.0.1 to >=2.1.0 (fixes compilation errors on Python 3.13) - Upgrade gradio from 3.50.2 to >=6.0.0 (includes audioop-lts for Python 3.13) - Upgrade datasets from 2.15.0 to >=4.0.0 (fixes HfFolder import error with newer huggingface_hub)
…tories globally - Add .env to ignore environment files - Add **/__pycache__/ to ignore Python cache directories - Add database/**/*.txt to ignore text files in database directory - Use global patterns for .pyc, .ipynb, and .DS_Store files - Consolidate CSV ignore pattern to database/**/*.csv
- Integrate ChatOllama into Planner, ReactPlanner, ReactReflectPlanner, and ReactAgent - Route models with names starting with 'ollama:' to local Ollama server - Add debug logging of LLM backend in Planner - Add ollama Python client to requirements
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