fix(server): improve self hosted usability (#15510)

fix #15505
fix #15502
fix #15496
fix #15491

#### PR Dependency Tree


* **PR #15510** 👈

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 configurable delays for invitations, invite links, and document
publishing by newly created accounts.
- Added workspace action checks that explain blocked actions and retry
timing.
- BYOK setup now verifies model capabilities and saves only validated
options.

- **Bug Fixes**
- Improved BYOK probing for chat, structured responses, tool calls,
embeddings, reranking, and image generation.
  - Preserved probe request order and strengthened response validation.
  - Authentication configuration changes now reload correctly.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/admin/src/config.json

@@ -87,9 +87,9 @@
       "type": "Boolean",
       "desc": "Whether require email verification before accessing restricted resources(not implemented)."
     },
-    "newAccountShareActionDelay": {
+    "newAccountActionDelay": {
       "type": "Number",
-      "desc": "Minimum account age in seconds before new accounts can invite members or create share links."
+      "desc": "Minimum account age in seconds before new accounts can invite members, create invite links, or publish documents. Set to 0 to disable."
     },
     "trustedCloudflareHeaders": {
       "type": "Boolean",

packages/frontend/admin/src/modules/settings/config.ts

@@ -58,9 +58,9 @@ export const KNOWN_CONFIG_GROUPS = [
       'allowSignup',
       'allowSignupForOauth',
       {
-        key: 'newAccountShareActionDelay',
+        key: 'newAccountActionDelay',
         type: 'Number',
-        desc: 'Minimum account age in seconds before new accounts can invite members or create share links.',
+        desc: 'Minimum account age in seconds before accounts can invite members, create invite links, or publish documents. Set to 0 to disable.',
       },
       // nested json object
       {