feat(providers): register opencode executors and add UI metadata

- Register OpencodeExecutor for 'opencode-zen' and 'opencode-go' in executors map
- Add OpencodeExecutor export in index.ts
- Add UI metadata for both providers in APIKEY_PROVIDERS:
  - OpenCode Zen: https://opencode.ai/zen
  - OpenCode Go: https://opencode.ai/zen/go
- Both use 'opencode' icon with #6366f1 color

open-sse/executors/index.ts

@@ -8,6 +8,7 @@ import { CursorExecutor } from "./cursor.ts";
 import { DefaultExecutor } from "./default.ts";
 import { PollinationsExecutor } from "./pollinations.ts";
 import { CloudflareAIExecutor } from "./cloudflare-ai.ts";
+import { OpencodeExecutor } from "./opencode.ts";
 
 const executors = {
   antigravity: new AntigravityExecutor(),
@@ -22,6 +23,8 @@ const executors = {
   pol: new PollinationsExecutor(), // Alias
   "cloudflare-ai": new CloudflareAIExecutor(),
   cf: new CloudflareAIExecutor(), // Alias
+  "opencode-zen": new OpencodeExecutor("opencode-zen"),
+  "opencode-go": new OpencodeExecutor("opencode-go"),
 };
 
 const defaultCache = new Map();
@@ -47,3 +50,4 @@ export { CursorExecutor } from "./cursor.ts";
 export { DefaultExecutor } from "./default.ts";
 export { PollinationsExecutor } from "./pollinations.ts";
 export { CloudflareAIExecutor } from "./cloudflare-ai.ts";
+export { OpencodeExecutor } from "./opencode.ts";

src/shared/constants/providers.ts

@@ -496,6 +496,22 @@ export const APIKEY_PROVIDERS = {
     website: "https://tavily.com",
     authHint: "API key from app.tavily.com (format: tvly-...)",
   },
+  "opencode-zen": {
+    id: "opencode-zen",
+    alias: "opencode-zen",
+    name: "OpenCode Zen",
+    icon: "opencode",
+    color: "#6366f1",
+    website: "https://opencode.ai/zen",
+  },
+  "opencode-go": {
+    id: "opencode-go",
+    alias: "opencode-go",
+    name: "OpenCode Go",
+    icon: "opencode",
+    color: "#6366f1",
+    website: "https://opencode.ai/zen/go",
+  },
   alibaba: {
     id: "alibaba",
     alias: "ali",