Fix namespaced model support & typos

[opencode-agent]

I've addressed the issue where namespaced model and resource classes were causing crashes in the jsonapi-swagger generator.

Key changes include:

• Fixed model_klass in SwaggerGenerator to use the full model_class_name instead of just the file_name, ensuring namespaced models are correctly constantized.
• Refactored Jsonapi::Swagger::Resource.with to use safe_constantize instead of Object.const_defined?, which improves compatibility with Rails' Zeitwerk/autoloading for namespaced constants.
• Added improved support for namespaced serializable resource classes (e.g., Dental::SerializablePatient for a Dental::Patient model).
• Corrected common misspellings (resouces -> resources) throughout the generator and templates for better code quality and consistency.

These changes ensure that running rails generate jsonapi:swagger MyModule::MyModel works correctly as expected.

Closes #14

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