storkit: merge 389_story_whatsapp_phone_number_allowlist_authorization

.storkit/bot.toml.whatsapp-meta.example

@@ -26,3 +26,8 @@ whatsapp_verify_token = "my-secret-verify-token"
 
 # Maximum conversation turns to remember per user (default: 20).
 # history_size = 20
+
+# Optional: restrict which phone numbers can interact with the bot.
+# When set, only listed numbers are processed; all others are silently ignored.
+# When absent or empty, all numbers are allowed (open by default).
+# whatsapp_allowed_phones = ["+15551234567", "+15559876543"]