Confirmed live: PSTN_PERSONAL_OWNER came back empty despite a real
assignment existing, because the Security Dashboard stores personal DIDs
as 10 digits (PERSONAL_DID_RE = ^\d{10}$) while Anveo's inbound INVITE
delivers the called number as 11-digit E.164 (with leading 1) in ${EXTEN}
- confirmed via PSTN_DID_CALLED=15557776655 in the live test. AST_CONFIG()
looking up an 11-digit key never found the 10-digit section.
Normalizes to 10 digits before the lookup (strips a leading digit only
when the string is actually 11 characters, so this doesn't misfire against
a provider that already sends 10). Also fixed the dashboard's own DID
input placeholder, which contradicted its own 10-digit validation error.