AUTO-001: add automation approval workflow

Closes #21

app/config.py

@@ -9,6 +9,7 @@ class Settings:
     ha_url: str | None = None
     ha_token: str | None = None
     model_store: str = ".model_store"
+    automation_store: str = ".automation_store"
 
     @property
     def ha_configured(self) -> bool:
@@ -20,4 +21,5 @@ def load_settings() -> Settings:
         ha_url=os.getenv("SILLYHOME_HA_URL") or os.getenv("HA_URL"),
         ha_token=os.getenv("SILLYHOME_HA_TOKEN") or os.getenv("HA_TOKEN"),
         model_store=os.getenv("SILLYHOME_MODEL_STORE", ".model_store"),
+        automation_store=os.getenv("SILLYHOME_AUTOMATION_STORE", ".automation_store"),
     )