feat(server): improve context management (#15448)

#### PR Dependency Tree


* **PR #15448** 👈

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 artifact upload, browsing, removal, deduplication, and
library ownership support.
* Copilot now supports scoped document and artifact search, canvas
reading, live editor context, and frontend tools.
* Added scope and focus selectors with source-resolution receipts in
chat.
* Added embedding health, progress, synchronization, and retrieval
capabilities.
* Added BYOK policy visibility, provider restrictions, endpoint dialect
selection, and validation.
* Added delegated editor interactions and userdata document
authorization.

* **Bug Fixes**
* Improved attachment handling, cancellation, access control, retrieval
fallbacks, workspace synchronization, and configuration validation.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Cargo.toml

@@ -16,7 +16,7 @@ resolver = "3"
   [workspace.dependencies]
   aes-gcm = "0.10"
   affine_common = { path = "./packages/common/native" }
-  affine_doc_loader = "0.1.4"
+  affine_doc_loader = "0.1.7"
   affine_importer = "0.1.2"
   affine_nbstore = { path = "./packages/frontend/native/nbstore" }
   affine_preview = { version = "0.1.0", default-features = false }