ai: Disable model controls.

Chat/Models and system prompt controls will not function because the placeholder database is set to read-only. Therefore, this is completely unnecessary at the moment.

* Partial revert "ai: Enable advanced features."
636142d6f6b7b57fee450baee9e91a19b19aa629.

webui.db

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:e39e63e2e230651fc1b197771c6d5ef3cd4ba73edde248d58415e574e7510f50
+oid sha256:efaa75a0f2b9df4ebb1f090ffd78d0527c39d5534471f1f2d67c9500dda69e57
 size 9211904