Add initial project files

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/config.py

@@ -0,0 +1,14 @@
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    database_url: str
+    secret_key: str
+    access_token_expire_minutes: int = 480
+    algorithm: str = "HS256"
+
+    class Config:
+        env_file = ".env"
+
+
+settings = Settings()