Add app scaffold and workflows

app/backend/api/__init__.py

@@ -0,0 +1 @@
+"""API package with versioned routers."""

app/backend/api/v1/__init__.py

@@ -0,0 +1 @@
+"""API v1 package."""

app/backend/api/v1/router.py

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+"""Version 1 API router aggregator for features."""
+
+from fastapi import APIRouter
+
+from features.auth.router import router as auth_router
+
+router = APIRouter()
+router.include_router(auth_router)