fix: adapting guardrail for use in agentkit (#484)

Author: BhAem

veadk/tools/builtin_tools/llm_shield.py

@@ -64,7 +64,9 @@ def __init__(self, timeout: int = 50) -> None:
         super().__init__(name=self.name)
 
         self.appid = getenv("TOOL_LLM_SHIELD_APP_ID")
-        self.region = getenv("TOOL_LLM_SHIELD_REGION", "cn-beijing")
+        self.region = (
+            os.getenv("REGION") or os.getenv("TOOL_LLM_SHIELD_REGION") or "cn-beijing"
+        )
         self.timeout = timeout
         self.url = getenv(
             "TOOL_LLM_SHIELD_URL",