Document AI Management chat history

[enisn]

Documentation for https://github.com/volosoft/volo/pull/22563.

ABP Studio companion: https://github.com/volosoft/abp-studio/pull/5162

Summary

• document per-user server-side conversation and Agent Framework session persistence
• list the conversation application service operations and HTTP endpoints
• update MVC, Angular, and Blazor component guidance to use server-generated conversation IDs
• distinguish persisted conversations from explicitly enabled ephemeral chat behavior
• remove outdated browser and local-storage claims

Validation

• verified service names, DTOs, routes, and component parameters against the implementation
• confirmed no stale client-side/local-storage claims remain in the AI Management guide
• git diff --check

[Copilot]

Pull request overview

Updates the AI Management module documentation to reflect server-side, per-user persisted chat conversations (including Agent Framework session persistence) and to align the MVC/Angular/Blazor integration guidance with server-generated conversation IDs rather than client-side storage.

Changes:

• Documented server-side conversation history, ownership/permission expectations, and the IChatConversationAppService + /api/chat-conversations endpoint surface.
• Updated MVC widget, Angular component, and Blazor component docs to use server-generated conversation IDs and clarified ephemeral chat behavior options.
• Adjusted the JavaScript API guidance to reflect conversation attachment semantics and clarified that clearing the UI does not delete server history.