docs: Config Docs Update (#148)

* 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

---------

Co-authored-by: you-n-g <you-n-g@users.noreply.github.com>

rdagent/core/conf.py

@@ -20,7 +20,7 @@ class RDAgentSettings(BaseSettings):
     log_trace_path: str | None = None
     log_llm_chat_content: bool = True
 
-    use_azure: bool = True
+    use_azure: bool = False
     use_azure_token_provider: bool = False
     managed_identity_client_id: str | None = None
     max_retry: int = 10
@@ -48,7 +48,7 @@ class RDAgentSettings(BaseSettings):
     chat_token_limit: int = (
         100000  # 100000 is the maximum limit of gpt4, which might increase in the future version of gpt
     )
-    default_system_prompt: str = "You are an AI assistant who helps to answer user's questions about finance."
+    default_system_prompt: str = "You are an AI assistant who helps to answer user's questions."
 
     # Embedding configs
     embedding_openai_api_key: str = ""

rdagent/oai/llm_utils.py

@@ -298,14 +298,21 @@ class APIBackend:
             self.use_azure_token_provider = self.cfg.use_azure_token_provider
             self.managed_identity_client_id = self.cfg.managed_identity_client_id
 
-            if self.cfg.openai_api_key:
-                self.chat_api_key = self.cfg.openai_api_key
-                self.embedding_api_key = self.cfg.openai_api_key
-            else:
-                self.chat_api_key = self.cfg.chat_openai_api_key if chat_api_key is None else chat_api_key
-                self.embedding_api_key = (
-                    self.cfg.embedding_openai_api_key if embedding_api_key is None else embedding_api_key
-                )
+            # Priority: chat_api_key/embedding_api_key > openai_api_key > os.environ.get("OPENAI_API_KEY")
+            # TODO: Simplify the key design. Consider Pandatic's field alias & priority.
+            self.chat_api_key = (
+                chat_api_key
+                or self.cfg.chat_openai_api_key
+                or self.cfg.openai_api_key
+                or os.environ.get("OPENAI_API_KEY")
+            )
+            self.embedding_api_key = (
+                embedding_api_key
+                or self.cfg.embedding_openai_api_key
+                or self.cfg.openai_api_key
+                or os.environ.get("OPENAI_API_KEY")
+            )
+
             self.chat_model = self.cfg.chat_model if chat_model is None else chat_model
             self.encoder = tiktoken.encoding_for_model(self.chat_model)
             self.chat_api_base = self.cfg.chat_azure_api_base if chat_api_base is None else chat_api_base