Add product categories and entities for tags in the future (#74)

* Add product category and tag entities

* Initial progress on shop category controller

* Fix GetCategory endpoint

* Wrap up product categories

Author: ptlthg

EliteAPI/Background/Discord/RefreshProductsBackgroundJob.cs

@@ -73,7 +73,6 @@ private async Task RefreshDiscordProducts(CancellationToken ct) {
                 context.Products.Add(new Product {
                     Id = id,
                     Type = discordProduct.Type,
-                    Category = ProductCategory.None,
                     Name = discordProduct.Name,
                     Slug = discordProduct.Slug,
                     Flags = discordProduct.Flags,

EliteAPI/Controllers/AccountController.cs

@@ -47,10 +47,10 @@ public async Task<ActionResult<AuthorizedAccountDto>> Get()
             .Include(a => a.MinecraftAccounts)
             .ThenInclude(a => a.Badges)
             .Include(a => a.Entitlements.Where(e => !e.Deleted))
-            .ThenInclude(a => a.Product)
-            .ThenInclude(p => p.WeightStyles)
+                .ThenInclude(a => a.Product)
+                .ThenInclude(p => p.WeightStyles)
             .Include(a => a.UserSettings)
-            .ThenInclude(a => a.WeightStyle)
+                .ThenInclude(a => a.WeightStyle)
             .AsSplitQuery()
             .FirstOrDefaultAsync(a => a.Id.Equals(user.AccountId));