WIP checkpoint: Scaffold FastAPI backend project structure

backend/app/config.py

@@ -1,8 +1,9 @@
 """Application configuration via pydantic-settings."""
 
-from pydantic_settings import BaseSettings
 from functools import lru_cache
 
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
 
 class Settings(BaseSettings):
     # App
@@ -28,15 +29,17 @@ class Settings(BaseSettings):
     UPLOAD_DIR: str = "uploads"
     MAX_UPLOAD_SIZE_MB: int = 100
 
+    model_config = SettingsConfigDict(
+        env_file=".env",
+        env_file_encoding="utf-8",
+        case_sensitive=True,
+        extra="ignore",
+    )
+
     @property
     def cors_origins_list(self) -> list[str]:
         return [origin.strip() for origin in self.CORS_ORIGINS.split(",")]
 
-    class Config:
-        env_file = ".env"
-        env_file_encoding = "utf-8"
-        case_sensitive = True
-
 
 @lru_cache()
 def get_settings() -> Settings: