Release 0.3.4: Jellyfin 12 stable support and audit fixes

Harden proxy permissions and cache behavior, streamline metadata fetching, remove obsolete rules, and validate the stable SDK with expanded regression coverage. Document backup format changes.

src/Jellyfin.Plugin.Multilang/Services/Providers/ProviderHttp.cs

@@ -39,29 +39,33 @@ public static class ProviderHttp
     public static async Task<HttpResponseMessage> SendWithRetryAsync(
         HttpClient http,
         HttpRequestMessage request,
-        CancellationToken cancellationToken)
+        CancellationToken cancellationToken,
+        FetchRateLimiter? rateLimiter = null)
     {
         const int maxAttempts = 3;
         for (var attempt = 1; attempt <= maxAttempts; attempt++)
         {
             try
             {
-                var response = await http.SendAsync(Clone(request), cancellationToken).ConfigureAwait(false);
+                if (rateLimiter is not null)
+                    await rateLimiter.WaitAsync(cancellationToken).ConfigureAwait(false);
+                using var attemptRequest = Clone(request);
+                var response = await http.SendAsync(attemptRequest, cancellationToken).ConfigureAwait(false);
+                Record(request, "HTTP " + (int)response.StatusCode, attempt);
                 if (response.IsSuccessStatusCode || Classify(response.StatusCode) == ProviderFailureKind.Terminal || attempt == maxAttempts)
                 {
-                    Record(request, "HTTP " + (int)response.StatusCode, attempt);
                     return response;
                 }
 
                 var delay = GetRetryDelay(response, attempt);
                 response.Dispose();
-                await Task.Delay(delay, cancellationToken).ConfigureAwait(false);
+                await Task.Delay(delay < TimeSpan.Zero ? TimeSpan.Zero : delay, cancellationToken).ConfigureAwait(false);
             }
-            catch (Exception ex)
+            catch (Exception ex) when (!cancellationToken.IsCancellationRequested && ex is HttpRequestException or OperationCanceledException)
             {
+                Record(request, ex.GetType().Name, attempt);
                 if (attempt >= maxAttempts)
                 {
-                    Record(request, ex.GetType().Name, attempt);
                     throw;
                 }