feat(opencode): remplace le profil Ollama HTTP par OpenCode

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/features/first-run/profile.ts

@@ -125,6 +125,9 @@ export function validateProfile(p: AgentProfile): ProfileErrors {
       Object.assign(errors, validateHttpChatConfig(p.chatHttp));
     }
   }
+  if (p.structuredAdapter === "openCode" && p.opencode?.model !== undefined) {
+    if (p.opencode.model.trim().length === 0) errors.model = "Model is required.";
+  }
   return errors;
 }