Inconsistent configuration files and useless LLM settings in FULLGUIDE

[RoadToNowhereX]

According to utils/call_llm_api.py, Line 16 to Line 18, LLM config will be read from .env instead of base_config.yaml, making configuration files inconsistent.

LLM override in FULLGUIDE is completely useless because of reasons mentioned above and config/config_loader.py has nothing about "llm".

utils/call_llm_api.py's Line 47 defines a fixed temperature of 0.3 for LLM, which is too low for most LLMs, and it can not be changed by external settings.