feat(auth): add first-run setup wizard

docs/getting-started.md

@@ -49,6 +49,8 @@ Expected flow:
 4. Return to the terminal when the browser step completes.
 5. Confirm the account appears in the saved account list.
 
+On a brand-new install (no `openai-codex-accounts.json` yet), `codex auth login` opens a first-run setup screen before OAuth. Use it to restore from backups, import accounts from a companion app pool, run doctor/check paths, open settings and Codex CLI sync, or skip straight to login. All actions reuse the existing backup browser, import, doctor, and settings flows. Upgrade note: no npm scripts changed, so existing automation remains compatible.
+
 If interactive `codex auth login` starts with zero saved accounts and recoverable named backups in your `backups/` directory, the login flow will prompt you to restore before opening OAuth. Confirm to launch the existing restore manager; skip to proceed with a fresh login. The prompt is suppressed in non-interactive/fallback flows and after same-session `fresh` or `reset` actions.
 
 Verify the new account:
@@ -82,6 +84,8 @@ Use the restore path when you already have named backup files and want to recove
 
 The restore manager shows each backup name, account count, freshness, and whether the restore would exceed the account limit before it lets you apply anything.
 
+If you already have an OpenCode account pool on the same machine, use the recovery import option from the login dashboard to preview and import those saved accounts before creating new OAuth sessions. The detector checks the standard OpenCode account file and honors `CODEX_OPENCODE_POOL_PATH` when you need to point at a specific file.
+
 ---
 
 ## Sync And Settings

lib/cli.ts

@@ -62,6 +62,7 @@ export type LoginMode =
 	| "check"
 	| "deep-check"
 	| "verify-flagged"
+	| "import-opencode"
 	| "restore-backup"
 	| "cancel";
 
@@ -248,6 +249,9 @@ async function promptLoginModeFallback(
 			) {
 				return { mode: "restore-backup" };
 			}
+			if (normalized === "i" || normalized === "import-opencode") {
+				return { mode: "import-opencode" };
+			}
 			if (normalized === "q" || normalized === "quit")
 				return { mode: "cancel" };
 			console.log(UI_COPY.fallback.invalidModePrompt);