feat: Implement notification system with Apprise integration and credential checks

app/utils/config_validator.py

@@ -5,14 +5,23 @@ This file serves as a backward-compatible interface to the config_validator pack
 """
 
 # Import and re-export all functions from the new package
-from app.utils.config_validator.validators import validate_email_config, validate_storage_configs, check_all_configs
+from app.utils.config_validator.validators import (
+    validate_email_config, 
+    validate_storage_configs, 
+    validate_notification_config,
+    check_all_configs
+)
 from app.utils.config_validator.masking import mask_sensitive_value
 from app.utils.config_validator.providers import get_provider_status
-from app.utils.config_validator.settings_display import get_settings_for_display, dump_all_settings
+from app.utils.config_validator.settings_display import (
+    get_settings_for_display,
+    dump_all_settings
+)
 
 __all__ = [
     'validate_email_config',
     'validate_storage_configs',
+    'validate_notification_config',
     'mask_sensitive_value',
     'get_provider_status',
     'get_settings_for_display',
@@ -20,3 +29,4 @@ __all__ = [
     'check_all_configs'
 ]
 
+