Added contributor classes for manga. Implemented MangaDex search.

MangaReader.Core/Search/NatoManga/NatoMangaSearchProvider.cs

@@ -1,14 +1,44 @@
 using MangaReader.Core.HttpService;
+using System.Globalization;
+using System.Text;
+using System.Text.RegularExpressions;
 
 namespace MangaReader.Core.Search.NatoManga;
 
 public class NatoMangaSearchProvider(IHttpService httpService) : MangaSearchProviderBase<NatoMangaSearchResult[]>(httpService)
 {
-    // https://www.natomanga.com/home/search/json?searchword=gal_can_t_be_kind
-
     protected override string GetSearchUrl(string keyword)
     {
-        return $"https://www.natomanga.com/home/search/json?searchword={keyword}";
+        string formattedSeachWord = GetFormattedSearchWord(keyword);
+
+        return $"https://www.natomanga.com/home/search/json?searchword={formattedSeachWord}";
+    }
+
+    private static string GetFormattedSearchWord(string input)
+    {
+        if (string.IsNullOrWhiteSpace(input))
+            return string.Empty;
+
+        // Convert to lowercase and normalize to decompose accents
+        string normalized = input.ToLowerInvariant()
+            .Normalize(NormalizationForm.FormD);
+
+        // Remove diacritics
+        var sb = new StringBuilder();
+        foreach (var c in normalized)
+        {
+            var unicodeCategory = CharUnicodeInfo.GetUnicodeCategory(c);
+            if (unicodeCategory != UnicodeCategory.NonSpacingMark)
+                sb.Append(c);
+        }
+
+        // Replace non-alphanumeric characters with underscores
+        string cleaned = Regex.Replace(sb.ToString(), @"[^a-z0-9]+", "_");
+
+        // Trim and collapse underscores
+        cleaned = Regex.Replace(cleaned, "_{2,}", "_").Trim('_');
+
+        return cleaned;
     }
 
     protected override MangaSearchResult[] GetSearchResult(NatoMangaSearchResult[] searchResult)
@@ -18,6 +48,7 @@ public class NatoMangaSearchProvider(IHttpService httpService) : MangaSearchProv
             {
                 Source = "NatoManga",
                 Title = searchResult.Name,
+                Thumbnail = searchResult.Thumb,
                 Url = searchResult.Url
             });