Fix allowedSenders to use actual sender phone number

The allowedSenders had the Telnyx inbound number (+14157049277)
instead of the sender's phone number (+18322070387). This caused
all inbound SMS to be rejected since the sender wasn't in the allowlist.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

config/sms-sites.json

@@ -2,7 +2,7 @@
   "sites": [
     {
       "allowedSenders": [
-        "+14157049277"
+        "+18322070387"
       ],
       "phoneNumber": "+14157049277",
       "repoRoot": ".",