docs: Add release notes for 2.25.0

docs/source/guide/release_notes/onprem/2.25.0.md

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+## Label Studio Enterprise 2.25.0
+
+<div class="onprem-highlight">Prompts on-prem availability, storage proxies, PDF tag, KeyPointLabels support, multi-task JSON imports for cloud</div>
+
+*Jun 17, 2025*
+
+Helm Chart version: [1.9.15](https://github.com/HumanSignal/charts/blob/master/heartex/label-studio/Chart.yaml)
+
+### New features
+
+#### Prompts availability for on-prem deployments
+
+You can now configure your on-prem environment to use Prompts! 
+
+Prompts is an interface to easily integrate LLMs into your own Label Studio deployment. Leading teams use it to pre-label data, compare models, and generate synthetic samples.
+
+You can find out more here:
+
+* [Prompts overview](prompts_overview)
+* [Prompts product page](https://humansignal.com/platform/prompts/)
+* [Blog - How to Generate Synthetic Data with Prompts in Label Studio](https://humansignal.com/blog/how-to-generate-synthetic-data-with-prompts-in-label-studio/)
+
+
+Installing Prompts requires license enablement and [additional install steps](install_prompts). Reach out to your CSM to enable a free trial!
+
+![Stylized image of Prompts](/images/releases/dog-prompts.png)
+
+#### Storage proxies for cloud files
+
+Label Studio now uses a proxy when accessing media files in connect cloud storages. For more information, see [Pre-signed URLs vs. storage proxies](https://docs.humansignal.com/guide/storage#Pre-signed-URLs-vs-Storage-proxies).
+
+Proxy mode is only used when the **Use pre-signed URLs** option is disabled in source storage.
+
+Storage proxies offer secure media access, simplified configuration, and improved performance.
+
+- Keeps data access within Label Studio's network boundary, ideal for on-premise environments
+- Enforces strict task-level access control, even for cached files
+- Eliminates the need for presigned URLs and CORS configuration
+- Solves performance and reliability issues for large files, videos, and audio
+- Media is now streamed via proxy, improving compatibility and scalability
+
+#### New PDF tag
+
+A [new PDF tag](/tags/pdf) lets you directly ingest PDF URLs for classification without needing to use hypertext tags.
+
+This also simplifies the process for using PDFs with Prompts for summarization and classification tasks. 
+
+
+
+### Enhancements
+
+#### KeyPointLabels exports for COCO and YOLO
+
+COCO and YOLO export formats now available for `KeyPointLabels`. For more information, see [our docs](https://docs.humansignal.com/guide/export#COCO). 
+
+#### Multi-task JSON imports for cloud
+
+Previously, if you loaded JSON tasks from source storage, you could only configure one task per JSON file.
+
+This restriction has been removed, and you can now specify multiple tasks per JSON file as long as all tasks follow the same format.
+
+For more information, see the examples in our [our docs](https://docs.humansignal.com/guide/storage#Off).
+
+
+#### Miscellaneous
+
+- The **Export Underlying Data** option was recently introduced and is available from the Annotations chart in the [annotator performance dashboard](dashboard_annotator). This allows you to export information about the tasks that the selected users have annotated. 
+
+    Previously, users were only identified by user ID within the CSV. With this update, you can also identify users by email.
+
+- User interface enhancements for the AI Assistant, including a new icon.
+
+
+### Bug fixes
+
+- Fixed various user interface issues associated with the new dark mode feature.
+
+- Fixed an issue where the **Not Activated** role was hidden by default on the Organization page.
+
+- Fixed several small issues related to the annotator agreement score popover.
+
+- Fixed an issue where when moving around panels in the labeling interface, groups were not sticking in place.
+
+- Fixed an issue where the token refresh function was not using the user-supplied `httpx_client`.
+
+- Fixed an issue with cloud storage in which tasks would not resolve correctly if they referenced data in different buckets.
+
+- Fixed an issue where the drop-down menu to select a user role was overflowing past the page edge.
+
+