feat: enhance release synchronization with cancellation support, error handling, and logging

- Added `CancellationToken` support across SyncService, GithubService, ForgejoService, and ReleaseAssetDownloadService.
- Improved error handling with detailed logging for asset downloads, deletions, and API operations.
- Refactored SyncService for clearer repository and asset synchronization logic.
- Enhanced performance with async file streams and refined conditional checks.

Services/GithubService.cs

@@ -6,38 +6,35 @@ using Microsoft.Extensions.Logging;
 
 namespace ForgejoReleaseSync.Services;
 
-public class GithubService(
-    AppConfig config,
-    RepositoryConfig repoConfig,
-    HttpClient httpClient,
-    ILogger<GithubService> logger)
+public class GithubService(HttpClient httpClient, ILogger<GithubService> logger)
 {
-    public async Task<List<GithubReleaseResponseDto>> FetchRepoReleasesAsync(string owner, string repo)
+    public async Task<List<GithubReleaseResponseDto>> FetchRepoReleasesAsync(
+        string owner, string repo, CancellationToken token = default)
     {
         try
         {
-            var response = await httpClient.GetAsync(
-                new Uri($"https://api.github.com/repos/{owner}/{repo}/releases?per_page=3&page=1"));
-
+            using var response = await httpClient.GetAsync(
+                new Uri($"https://api.github.com/repos/{owner}/{repo}/releases?per_page=3&page=1"),
+                token);
             response.EnsureSuccessStatusCode();
 
-            var responseStream = await response.Content.ReadAsStreamAsync();
-            var releases = await JsonSerializer.DeserializeAsync(responseStream,
-                AppJsonSerializerContext.Default.ListGithubReleaseResponseDto);
+            await using var stream = await response.Content.ReadAsStreamAsync(token);
+            var releases = await JsonSerializer.DeserializeAsync(
+                stream, AppJsonSerializerContext.Default.ListGithubReleaseResponseDto, token);
 
             return releases ?? [];
         }
         catch (Exception ex)
         {
-            logger.LogError(ex, "Failed to fetch posts from Mastodon");
+            logger.LogError(ex, "Failed to fetch GitHub releases for {Owner}/{Repo}", owner, repo);
             throw;
         }
     }
 }
 
-// TODO: move this
 [JsonSerializable(typeof(List<GithubReleaseResponseDto>))]
 [JsonSerializable(typeof(ForgejoCreateReleaseDto))]
+[JsonSerializable(typeof(ForgejoReleaseResponseDto))]
 [JsonSerializable(typeof(List<ForgejoReleaseResponseDto>))]
 internal partial class AppJsonSerializerContext : JsonSerializerContext
 {