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 -->

packages/frontend/admin/src/config.json

@@ -369,6 +369,18 @@
       "type": "Boolean",
       "desc": "Enable AI features. Workspace owners configure provider keys in Workspace Settings → Integrations → AI BYOK."
     },
+    "unsplash": {
+      "type": "Object",
+      "desc": "The config for the unsplash key."
+    },
+    "exa": {
+      "type": "Object",
+      "desc": "The config for the exa web search key."
+    },
+    "storage": {
+      "type": "Object",
+      "desc": "The config for the storage provider."
+    },
     "byok.enabled": {
       "type": "Boolean",
       "desc": "Allow workspace owners and admins to configure AI provider keys through AI BYOK."
@@ -384,22 +396,6 @@
     "byok.allowPrivateEndpoint": {
       "type": "Boolean",
       "desc": "Whether workspace BYOK custom endpoints may resolve to private network targets. Enabling this allows workspace owners and admins to send provider probe requests to the private network."
-    },
-    "providers.profiles": {
-      "type": "Array",
-      "desc": "The profile list for copilot providers."
-    },
-    "unsplash": {
-      "type": "Object",
-      "desc": "The config for the unsplash key."
-    },
-    "exa": {
-      "type": "Object",
-      "desc": "The config for the exa web search key."
-    },
-    "storage": {
-      "type": "Object",
-      "desc": "The config for the storage provider."
     }
   },
   "indexer": {