Fix download provider errors with exponential backoff and playmogo support

- Add exponential backoff retry logic to RecoveryStrategies (1s, 2s, 4s...)
- Add TimeoutError to network failure handling for HTTPS timeouts
- Add playmogo.com referer header for Doodstream provider
- Add Optional import to error_handler.py
- Add sanitize_url_for_logging utility function

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/core/providers/enhanced_provider.py

@@ -88,7 +88,10 @@ class EnhancedAniWorldLoader(Loader):
 
         self.PROVIDER_HEADERS = {
             ProviderType.VIDMOLY.value: ['Referer: "https://vidmoly.to"'],
-            ProviderType.DOODSTREAM.value: ['Referer: "https://dood.li/"'],
+            ProviderType.DOODSTREAM.value: [
+                'Referer: "https://dood.li/"',
+                'Referer: "https://playmogo.com/"',
+            ],
             ProviderType.VOE.value: [f'User-Agent: {self.RANDOM_USER_AGENT}'],
             ProviderType.LULUVDO.value: [
                 f'User-Agent: {self.LULUVDO_USER_AGENT}',