[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/account/profile.g.dart

@@ -268,7 +268,7 @@ class _AccountBadgesProviderElement
 }
 
 String _$accountAppbarForcegroundColorHash() =>
-    r'8ee0cae10817b77fb09548a482f5247662b4374c';
+    r'127fcc7fd6ec6a41ac4a6975276b5271aa4fa7d0';
 
 /// See also [accountAppbarForcegroundColor].
 @ProviderFor(accountAppbarForcegroundColor)