feat: add dedicated Decoy Fleet inventory page and API

decnet/web/repository.py

@@ -35,6 +35,11 @@ class BaseRepository(ABC):
         """Retrieve high-level dashboard metrics."""
         pass
 
+    @abstractmethod
+    async def get_deckies(self) -> list[dict[str, Any]]:
+        """Retrieve the list of currently deployed deckies."""
+        pass
+
     @abstractmethod
     async def get_user_by_username(self, username: str) -> Optional[dict[str, Any]]:
         """Retrieve a user by their username."""