fix(pairing): show actual code in approval command instead of placeholder (#13723)

* fix(pairing): show actual code in approval command instead of placeholder

The pairing reply shown to new users included the approval command with
a literal '<code>' placeholder. Users had to manually copy the code
from one line and substitute it into the command.

Now shows the ready-to-copy command with the real pairing code:

Before: openclaw pairing approve telegram <code>
After:  openclaw pairing approve telegram abc123

Fixed in both the shared pairing message builder and the Telegram
inline pairing reply.

* test(pairing): update test to expect actual code instead of placeholder

---------

Co-authored-by: Echo Ito <echoito@MacBook-Air.local>

src/pairing/pairing-messages.ts

@@ -15,6 +15,6 @@ export function buildPairingReply(params: {
     `Pairing code: ${code}`,
     "",
     "Ask the bot owner to approve with:",
-    formatCliCommand(`openclaw pairing approve ${channel} <code>`),
+    formatCliCommand(`openclaw pairing approve ${channel} ${code}`),
   ].join("\n");
 }