[agents] refactor to use IChatClient#1109
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Refactored codebase to replace custom chat models and Azure.AI.OpenAI usage with Microsoft.Extensions.AI types and OpenAI client integration. Updated service registration, workflow steps, and persistence logic to use new abstractions. Removed obsolete files and updated dependencies to Microsoft.Extensions.AI 10.8.0. Streamlined message and event models for improved compatibility and maintainability.
Replaced OpenAIClient with AzureOpenAIClient for chat and embedding services. Updated all related service registrations. Added Azure.AI.OpenAI 2.9.0-beta.1 NuGet package.
Changed "failed" in AdditionalProperties to retain its original type in ChatsService.cs. Removed an unused using directive from OutOfScopeResponder.cs for cleaner code.
Refactored codebase to remove custom pipeline envelope and state types in favor of ConversationState, IntentState, and direct payload records. Replaced IDexRunner/DexRunner with IDexChatClient/DexChatClient, aligning with Microsoft.Extensions.AI chat abstractions. Updated all pipeline step executors and workflow context to use new state and payload handling. Revised service registration and ChatsService to use new chat client and response types. Improved maintainability and reduced boilerplate by adopting the new chat pipeline model.
Citations and sources are now extracted from `final?.AdditionalProperties` in `ChatsService.cs` instead of defaulting to empty arrays. In `DexChatClient.cs`, the final chat response's `RawRepresentation` is simplified, and citations/sources are added to `AdditionalProperties`. All event class definitions are removed from `DexStreamEvent.cs`, reflecting a shift to a new event handling mechanism.
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