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 -->

tests/affine-cloud-copilot/e2e/basic/chat.spec.ts

@@ -384,8 +384,7 @@ test.describe('AIBasic/Chat', () => {
     await utils.chatPanel.waitForHistory(page, [
       {
         role: 'user',
-        content:
-          'AFFiNE is an open source all in one workspace.\nTranslate to chinese.',
+        content: 'Translate to chinese.',
       },
       {
         role: 'assistant',
@@ -470,8 +469,7 @@ test.describe('AIBasic/Chat', () => {
     await utils.chatPanel.waitForHistory(page, [
       {
         role: 'user',
-        content:
-          'AFFiNE is an open source all in one workspace.\nTranslate to chinese.',
+        content: 'Translate to chinese.',
       },
       {
         role: 'assistant',