finish the main code

app/__init__.py

@@ -0,0 +1,13 @@
+"""
+app/__init__.py
+
+Makes `app/` a Python package and exposes a single shared Config instance.
+
+Usage anywhere in the project:
+    from app import cfg
+    print(cfg.cache_ttl)
+"""
+
+from app.config import load
+
+cfg = load()