fix#14287fix#15359fix#15424
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Redesigned workspace AI provider settings with connection testing,
storage options, model selection, capability management, ordering, and
custom endpoints.
* AI chat model choices now adapt to the selected workspace and
conversation route.
* Added support for image-based AI requests.
* **Bug Fixes**
* Improved handling of unavailable or outdated model selections.
* App configuration updates now reject overlapping paths and load
deterministically.
* **Tests**
* Expanded coverage for provider models, AI chat scoping, image
requests, and configuration validation.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
#### PR Dependency Tree
* **PR #15426** 👈
This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added workspace BYOK profiles with provider/model catalogs, capability
validation, connection probing, credential rotation, reordering, and
secure local leases.
* Added Copilot route options, selectable targets, managed tiers,
explicit profile/model overrides, and improved streaming with tool
callbacks and abort support.
* Added Copilot availability controls to prevent access when the feature
is disabled.
* **Changes**
* Simplified Copilot configuration and removed legacy provider-specific
settings.
* Removed obsolete model, token-cost, transcript strategy, and provider
metadata fields from public responses.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
#### PR Dependency Tree
* **PR #14956** 👈
This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
## Release Notes
* **Bug Fixes**
* Improved Gemini Vertex provider configuration validation logic for
enhanced reliability.
* Refined Google Vertex publisher base URL construction handling.
* **Tests**
* Added test coverage for Gemini Embedding 2 model resolution.
* Added test coverage for Gemini Vertex provider Google Cloud
integration.
<!-- review_stack_entry_start -->
[](https://app.coderabbit.ai/change-stack/toeverything/AFFiNE/pull/14956)
<!-- review_stack_entry_end -->
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
DarkSky
