feat(opencode-go): add CLI install flag and TUI prompts

src/cli/cli-program.ts

@@ -31,6 +31,7 @@ program
   .option("--opencode-zen <value>", "OpenCode Zen access: no, yes (default: no)")
   .option("--zai-coding-plan <value>", "Z.ai Coding Plan subscription: no, yes (default: no)")
   .option("--kimi-for-coding <value>", "Kimi For Coding subscription: no, yes (default: no)")
+  .option("--opencode-go <value>", "OpenCode Go subscription: no, yes (default: no)")
   .option("--skip-auth", "Skip authentication setup hints")
   .addHelpText("after", `
 Examples:
@@ -57,6 +58,7 @@ Model Providers (Priority: Native > Copilot > OpenCode Zen > Z.ai > Kimi):
       opencodeZen: options.opencodeZen,
       zaiCodingPlan: options.zaiCodingPlan,
       kimiForCoding: options.kimiForCoding,
+      opencodeGo: options.opencodeGo,
       skipAuth: options.skipAuth ?? false,
     }
     const exitCode = await install(args)