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.

open-sse/executors/index.js

@@ -9,6 +9,7 @@ import { CursorExecutor } from "./cursor.js";
 import { VertexExecutor } from "./vertex.js";
 import { QwenExecutor } from "./qwen.js";
 import { OpenCodeExecutor } from "./opencode.js";
+import { OpenCodeGoExecutor } from "./opencode-go.js";
 import { GrokWebExecutor } from "./grok-web.js";
 import { PerplexityWebExecutor } from "./perplexity-web.js";
 import { DefaultExecutor } from "./default.js";
@@ -27,6 +28,7 @@ const executors = {
   "vertex-partner": new VertexExecutor("vertex-partner"),
   qwen: new QwenExecutor(),
   opencode: new OpenCodeExecutor(),
+  "opencode-go": new OpenCodeGoExecutor(),
   "grok-web": new GrokWebExecutor(),
   "perplexity-web": new PerplexityWebExecutor(),
 };
@@ -56,5 +58,6 @@ export { VertexExecutor } from "./vertex.js";
 export { DefaultExecutor } from "./default.js";
 export { QwenExecutor } from "./qwen.js";
 export { OpenCodeExecutor } from "./opencode.js";
+export { OpenCodeGoExecutor } from "./opencode-go.js";
 export { GrokWebExecutor } from "./grok-web.js";
 export { PerplexityWebExecutor } from "./perplexity-web.js";