[REF] refactor file pool model and imports

- Refactor SnFilePool using freezed + sealed for consistency with other Sn models
- Add extension method listFromResponse for PoolService compatibility
- Update PoolService and utils to use SnFilePool
- Replace relative imports (../) with package imports for clarity and maintainability

Signed-off-by: Texas0295 <kimura@texas0295.top>

lib/screens/posts/pub_profile.g.dart

@@ -400,7 +400,7 @@ class _PublisherSubscriptionStatusProviderElement
 }
 
 String _$publisherAppbarForcegroundColorHash() =>
-    r'd781a806a242aea5c1609ec98c97c52fdd9f7db1';
+    r'cd9a9816177a6eecc2bc354acebbbd48892ffdd7';
 
 /// See also [publisherAppbarForcegroundColor].
 @ProviderFor(publisherAppbarForcegroundColor)