feat(core): improve byok editing (#15427)

fix #14287
fix #15359
fix #15424

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Redesigned workspace AI provider settings with connection testing,
storage options, model selection, capability management, ordering, and
custom endpoints.
* AI chat model choices now adapt to the selected workspace and
conversation route.
  * Added support for image-based AI requests.
* **Bug Fixes**
  * Improved handling of unavailable or outdated model selections.
* App configuration updates now reject overlapping paths and load
deterministically.
* **Tests**
* Expanded coverage for provider models, AI chat scoping, image
requests, and configuration validation.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Cargo.lock

@@ -4753,9 +4753,9 @@ dependencies = [
 
 [[package]]
 name = "llm_adapter"
-version = "0.2.14"
+version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4f4086072a8f69a2a119e187367844d542f133f1bdf96ebdf495b49b83cf4a05"
+checksum = "5cfb4eab8636c2e3ac87a221630f6b458e1a7ffb32e3701576840871b98d1bc6"
 dependencies = [
  "base64",
  "jsonschema",