Remove Code Duplication (#732)

## What this does

cf61b71 introduced the save_to_database method, but did not replace the
(identical) partial implementation in the existing refresh! method.

## Type of change

- [ ] Bug fix
- [ ] New feature
- [ ] Breaking change
- [ ] Documentation
- [ ] Performance improvement
- [x] Code maintainability 

## Scope check

- [x] I read the [Contributing
Guide](https://github.com/crmne/ruby_llm/blob/main/CONTRIBUTING.md)
- [x] This aligns with RubyLLM's focus on **LLM communication**
- [x] This isn't application-specific logic that belongs in user code
- [x] This benefits most users, not just my specific use case

## Quality check

- [x] I ran `overcommit --install` and all hooks pass
- [x] I tested my changes thoroughly
- [ ] For provider changes: Re-recorded VCR cassettes with `bundle exec
rake vcr:record[provider_name]`
  - [x] All tests pass: `bundle exec rspec`
- [ ] I updated documentation if needed
- [ ] I didn't modify auto-generated files manually (`models.json`,
`aliases.json`)

## AI-generated code

- [ ] I used AI tools to help write this code
- [ ] I have reviewed and understand all generated code (required if
above is checked)

## API changes

- [ ] Breaking change
- [ ] New public methods/classes
- [ ] Changed method signatures
- [x] No API changes

Author: Aesthetikx

lib/ruby_llm/active_record/model_methods.rb

@@ -10,15 +10,7 @@ module ModelMethods
         def refresh!
           RubyLLM.models.refresh!
 
-          transaction do
-            RubyLLM.models.all.each do |model_info|
-              model = find_or_initialize_by(
-                model_id: model_info.id,
-                provider: model_info.provider
-              )
-              model.update!(from_llm_attributes(model_info))
-            end
-          end
+          save_to_database
         end
 
         def save_to_database