feat(event-notifier): improve environment variable handling

- Fix deserialization error when parsing config from environment variables
- Add proper array format support for adapters configuration
- Update environment variable examples with correct format
- Improve documentation for configuration loading
- Implement helper functions for environment variable validation

This change fixes the "invalid type: map, expected a sequence" error
by ensuring proper formatting of array-type fields in environment variables.

ecstore/src/heal/data_scanner.rs

@@ -1101,7 +1101,7 @@ pub fn lc_has_active_rules(config: &BucketLifecycleConfiguration, prefix: &str)
             return true;
         }
 
-        if let Some(Some(true)) = rule.expiration.as_ref().map(|e| e.expired_object_delete_marker.map(|m| m)) {
+        if let Some(Some(true)) = rule.expiration.as_ref().map(|e| e.expired_object_delete_marker) {
             return true;
         }