Added enterprise-managed activation for assistant plugins (#939)

app/MindWork AI Studio/wwwroot/changelog/v26.8.2.md

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 - Added protection against prompt injection. Documents, web pages, and retrieved content can carry instructions written for the AI rather than for you, for example, text telling it to ignore its rules or to hand over its instructions. AI Studio now always removes such passages before the content reaches a model, while the rest of your document stays intact and usable. When something was removed, AI Studio tells you and can show you which passages it took out. You can turn off the detailed dialog in the app settings. For IT departments: the new setting `DataApp.ShowPromptInjectionAlert` lets you configure the detailed dialog for your organization. Many thanks to Sabrina `Sabrina-devops` for implementing this feature and to Simon `SimonBpunkt` for his work on the detection patterns and their translations.
 - Added configurable direct-chat launchers for assistant plugins. Plugin authors and the Assistant Builder can now open a chat with a chosen workspace, provider, profile, chat template, and data sources, while unavailable or unauthorized selections are reported before a chat is created.
 - Added provider logos throughout AI Studio, making models easier to recognize at a glance. Configuration plugins can now give managed LLM, transcription, and embedding providers their own project icon with the optional `IconPath` field.
+- Added the option for IT departments to enable assistant plugins they rolled out. Approving an assistant only stated that it is safe, so everybody still had to switch it on themselves. An approval can now also enable the assistant, either as a default which you may switch off again, or in a way your IT department keeps in place. The plugin page and the security card of the assistant tell you which of the two applies.
 - Improved the safety of plugin symbols: AI Studio now shows the symbol of a plugin in isolation, so nothing inside a symbol can reach the rest of the app.
 - Improved how much memory AI Studio needs. Working with large documents used to grow the app to several gigabytes, and on macOS that memory was never handed back. AI Studio now stays at a fraction of that and returns memory to your system. This matters most on devices with little memory, such as a Raspberry Pi.
 - Improved the preview for large documents. It now shows you the beginning of your document instead of loading all of it, so the dialog opens right away. Your complete document still goes to the AI.