feat(config): add get_settings() with lru_cache for singleton pattern

server/config.py

@@ -1,4 +1,5 @@
 from pydantic_settings import BaseSettings
+from functools import lru_cache
 
 class Settings(BaseSettings):
     app_name: str = "RedTeamOS"
@@ -14,3 +15,7 @@ class Settings(BaseSettings):
     class Config:
         env_file = ".env"
         env_file_encoding = "utf-8"
+
+@lru_cache
+def get_settings() -> Settings:
+    return Settings()