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 -->

.docker/selfhost/schema.json

@@ -199,9 +199,9 @@
           "description": "Whether require email verification before accessing restricted resources(not implemented).\n@default true",
           "default": true
         },
-        "newAccountShareActionDelay": {
+        "newAccountActionDelay": {
           "type": "number",
-          "description": "Minimum account age in seconds before new accounts can invite members or create share links.\n@default 86400",
+          "description": "Minimum account age in seconds before new accounts can invite members, create invite links, or publish documents. Set to 0 to disable.\n@default 86400",
           "default": 86400
         },
         "trustedCloudflareHeaders": {