feat: add OpenCode Go provider and support for custom models

- Introduced OpenCode Go provider with relevant configurations.
- Enhanced model management by allowing users to add and delete custom models.
- Updated UI components to support model selection for image types.
- Adjusted sidebar visibility to include image media kinds.

src/shared/components/Sidebar.js

@@ -12,7 +12,7 @@ import Button from "./Button";
 import { ConfirmModal } from "./Modal";
 
 // const VISIBLE_MEDIA_KINDS = ["embedding", "image", "imageToText", "tts", "stt", "webSearch", "webFetch", "video", "music"];
-const VISIBLE_MEDIA_KINDS = ["embedding", "tts"];
+const VISIBLE_MEDIA_KINDS = ["embedding", "image", "tts"];
 
 const navItems = [
   { href: "/dashboard/endpoint", label: "Endpoint", icon: "api" },