fix: db model fixes and quote mapping

Mapping/QuoteMapping.cs

@@ -0,0 +1,32 @@
+using Microsoft.Extensions.Logging;
+using QuotifyBE.Data;
+using QuotifyBE.DTOs;
+using QuotifyBE.Entities;
+
+namespace QuotifyBE.Mapping;
+
+public static class QuoteMapping
+{
+
+    public static QuoteShortDTO ToQuoteShortDTO(this Quote quote, ApplicationDbContext db)
+    {
+
+        List<string> categoryNames = [];
+        if (quote.QuoteCategories != null)
+        {
+            foreach (QuoteCategory quoteCategory in quote.QuoteCategories)
+            {
+                categoryNames.Add(quoteCategory.Category!.Name ?? $"Unnamed category {quoteCategory.CategoryId}");
+            }
+        }
+
+        return new QuoteShortDTO
+        {
+            Id = quote.Id,
+            Text = quote.Text,
+            Author = quote.Author,
+            ImageUrl = quote.Image?.Url,
+            Categories = categoryNames
+        };
+    }
+}