add csfloat api usage

BlueLaminate/BlueLaminate.Scraper/Skins/SkinCatalogClient.cs

@@ -48,6 +48,8 @@ public sealed class SkinCatalogClient
         return new CatalogSkin(
             Id: dto.Id,
             WeaponName: dto.Weapon?.Name ?? "Unknown",
+            DefIndex: dto.Weapon?.WeaponId,
+            PaintIndex: dto.PaintIndex,
             Category: dto.Category?.Name ?? "Unknown",
             Team: MapTeam(dto.Team?.Id),
             // Knives with no finish carry a null pattern; "Vanilla" is the community term.
@@ -88,9 +90,11 @@ public sealed class SkinCatalogClient
         string Id,
         string? Name,
         string? Description,
-        NamedDto? Weapon,
+        WeaponDto? Weapon,
         NamedDto? Category,
         NamedDto? Pattern,
+        // Top-level paint index. AllowReadingFromString handles its string form.
+        int? PaintIndex,
         decimal? MinFloat,
         decimal? MaxFloat,
         NamedDto? Rarity,
@@ -102,4 +106,7 @@ public sealed class SkinCatalogClient
         List<NamedDto>? Crates);
 
     private sealed record NamedDto(string? Id, string? Name);
+
+    // Weapon carries a numeric weapon_id (the def_index) alongside id/name.
+    private sealed record WeaponDto(string? Id, int? WeaponId, string? Name);
 }