Add pagination and API improvements

- Add pagination to effects list with infinite scroll
- Refactor home stats into reusable get_user_stats function
- Add /api/stats endpoint for CLI/API clients
- Add has_more flag to recipes listing
- Add JSON API support to storage type page

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/routers/recipes.py

@@ -377,9 +377,10 @@ async def list_recipes(
         return RedirectResponse(url="/auth", status_code=302)
 
     recipes = await recipe_service.list_recipes(ctx.actor_id, offset=offset, limit=limit)
+    has_more = len(recipes) >= limit
 
     if wants_json(request):
-        return {"recipes": recipes, "offset": offset, "limit": limit}
+        return {"recipes": recipes, "offset": offset, "limit": limit, "has_more": has_more}
 
     from ..dependencies import get_nav_counts
     nav_counts = await get_nav_counts(ctx.actor_id)
@@ -390,6 +391,9 @@ async def list_recipes(
         user=ctx,
         nav_counts=nav_counts,
         active_tab="recipes",
+        offset=offset,
+        limit=limit,
+        has_more=has_more,
     )