Change to modelType when getting realtime model.

[hchen2020]

No description provided.

[GGHansome]

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Code Review Report

Issue Category	Issue Description	Suggested Improvement	Related Code Example
Naming Conventions	The use of modelType as a method parameter name is appropriate. However, ensure that all names adhere to this standard since it's consistent.	Double-check all method parameters and property names to ensure consistent naming convention application.	```csharp
public LlmModelSetting GetProviderModel(string provider, string id, bool? multiModal = null, LlmModelType? modelType = null, bool imageGenerate = false) ```
Single Responsibility	"LlmModelSetting" class carries multiple properties which can suggest multiple responsibilities.	Reevaluate the class structure to ensure that each class has one responsibility. Consider breaking down the class further if needed.	```csharp
public class LlmModelSetting
{

public bool MultiModal { get; set; }
public bool ImageGeneration { get; set; }

} ``` |
| Code Readability | The removal of realTime property from multiple method parameters and usages reflects improved clean coding and reads better. | Ensure consistency across the codebase when reflecting such changes, focusing also on removing dead code. | `realTime` property removed from multiple locations enhancing clarity. |
| Design Decision | The introduction of `LlmModelType` enumeration for identifying model types improves design clarity and scalability. | Verify that all usages of the model type reflect this enumeration wherever applicable across the code. |

public enum LlmModelType
{
    Chat = 2,
    Image = 3,
    Embedding = 4,
    Audio = 5,
    Realtime = 6
} ``` |
| **Code Duplication**      | Look for any duplicated logic within the `GetProviderModel` and `GetProviderModels` implementations; with added complexity comes increased risk of overlap. | Consider refactoring shared logic into separate methods or utility functions.                                                        | `GetProviderModel` and `GetProviderModels` appear to have overlapping filtering logic which can be refactored. |

### Summary
This recent code change reflects a positive direction towards improved scalability and code maintenance. The use of `LlmModelType` enhances flexibility and feature addition in the future. The changes seem to align well with best practices, though continued vigilance will be needed to ensure consistency across the code base. Keep an eye out for any pockets of residual old logic, unneeded properties, or duplicated logic as you move forward.

This review assumes the context of a broader refactor aligning with recent changes. Keep up the good work, ensuring that any similar improvements are mirrored across all modules and layers of the application.