iOS: port onboarding + QR pairing flow stability (#18162)

Merged via /review-pr -> /prepare-pr -> /merge-pr.

Prepared head SHA: a87eadea19e9d2e693300ac7382cd338eb87b472
Co-authored-by: mbelinky <132747814+mbelinky@users.noreply.github.com>
Co-authored-by: mbelinky <132747814+mbelinky@users.noreply.github.com>
Reviewed-by: @mbelinky

extensions/device-pair/index.ts

@@ -1,6 +1,15 @@
 import type { OpenClawPluginApi } from "openclaw/plugin-sdk";
 import os from "node:os";
 import { approveDevicePairing, listDevicePairing } from "openclaw/plugin-sdk";
+import qrcode from "qrcode-terminal";
+
+function renderQrAscii(data: string): Promise<string> {
+  return new Promise((resolve) => {
+    qrcode.generate(data, { small: true }, (output: string) => {
+      resolve(output);
+    });
+  });
+}
 
 const DEFAULT_GATEWAY_PORT = 18789;
 
@@ -434,6 +443,69 @@ export default function register(api: OpenClawPluginApi) {
         password: auth.password,
       };
 
+      if (action === "qr") {
+        const setupCode = encodeSetupCode(payload);
+        const qrAscii = await renderQrAscii(setupCode);
+        const authLabel = auth.label ?? "auth";
+
+        const channel = ctx.channel;
+        const target = ctx.senderId?.trim() || ctx.from?.trim() || ctx.to?.trim() || "";
+
+        if (channel === "telegram" && target) {
+          try {
+            const send = api.runtime?.channel?.telegram?.sendMessageTelegram;
+            if (send) {
+              await send(
+                target,
+                ["Scan this QR code with the OpenClaw iOS app:", "", "```", qrAscii, "```"].join(
+                  "\n",
+                ),
+                {
+                  ...(ctx.messageThreadId != null ? { messageThreadId: ctx.messageThreadId } : {}),
+                  ...(ctx.accountId ? { accountId: ctx.accountId } : {}),
+                },
+              );
+              return {
+                text: [
+                  `Gateway: ${payload.url}`,
+                  `Auth: ${authLabel}`,
+                  "",
+                  "After scanning, come back here and run `/pair approve` to complete pairing.",
+                ].join("\n"),
+              };
+            }
+          } catch (err) {
+            api.logger.warn?.(
+              `device-pair: telegram QR send failed, falling back (${String(
+                (err as Error)?.message ?? err,
+              )})`,
+            );
+          }
+        }
+
+        // Render based on channel capability
+        api.logger.info?.(`device-pair: QR fallback channel=${channel} target=${target}`);
+        const infoLines = [
+          `Gateway: ${payload.url}`,
+          `Auth: ${authLabel}`,
+          "",
+          "After scanning, run `/pair approve` to complete pairing.",
+        ];
+
+        // WebUI + CLI/TUI: ASCII QR
+        return {
+          text: [
+            "Scan this QR code with the OpenClaw iOS app:",
+            "",
+            "```",
+            qrAscii,
+            "```",
+            "",
+            ...infoLines,
+          ].join("\n"),
+        };
+      }
+
       const channel = ctx.channel;
       const target = ctx.senderId?.trim() || ctx.from?.trim() || ctx.to?.trim() || "";
       const authLabel = auth.label ?? "auth";