* refactor: unify qlib experiment configs, runners, and templates
* fix: use PropSetting instances instead of class attributes in qlib runners
* docs: add configurable train/valid/test time segments for fintech scenarios
* docs: update explanation for separate config use in litellm
* docs: update default backend to `rdagent.oai.backend.LiteLLMAPIBackend`
* docs: update .rst format
* Update installation_and_configuration.rst
* fix PR template
* subfolders of the log displayed on the web page
* fix code error
* add health check
* reformat with isort
* reformat with black
* update README
* fix bug && experience confusing
* reformat with black & update health check code
* reformat with isort
* reformat with black
* update README.md
* Removed duplicates in documentation and health_check && Upgraded code for filtering folders
* update docs
* reformat with black
* simplify RDAgent conf
* add unified cacher(untested)
* fix small bugs
* fix a bug
* fix a small bug in runner
* use hash_key = None to skip cache
* fix CI
* in factor execution, ignore cache when raise exception
* add file locker to avoid mp calling
* fix CI
* use function __module__ name as folder in cache
* Add a table & factor debug
* Congfig setting
* Update env example and configuration list.
Also change api priority
* Add a TODO for the rst
* CI: shorter line
* Update docs/installation_and_configuration.rst
* Update docs/installation_and_configuration.rst
* Update links & standard config
* Add TODO
* Fix bug
* Update rdagent/oai/llm_utils.py
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