Close remaining 10-vs-11-digit gaps in PSTN number input

Full audit of every phone-number comparison/storage point across
pstn-trunk.sh, security-dashboard.sh, asterisk.sh, asterisk-digital-ocean.sh,
and the vendored easy-asterisk base script, prompted by the inbound
Caller-ID normalization fix — the same digit-count mismatch was also
possible on the admin-input side, just silent instead of loud:

- security-dashboard.sh's write_permission(): a 10-digit whitelist entry
  was silently DROPPED (NUMBER_RE required exactly 11 digits), with no
  warning unless every entry in the field was invalid — a mixed
  10-digit + 11-digit list saved "successfully" while quietly losing the
  10-digit one. Now normalizes any bare 10-digit token to 11-digit instead
  of discarding it (_normalize_nanp_number).
- write_personal_did(): required exactly 10 digits, rejecting an
  11-digit entry outright with a clear (but avoidable) error. Now accepts
  either and normalizes to the canonical 10-digit storage form
  (_normalize_personal_did_input).
- pstn-trunk.sh's TRUNK_DID install prompt: same fix, strips a leading
  "1" instead of aborting the install over it.

Everything else checked out clean: outbound dialed-number matching
already normalizes via the existing _NXXNXXXXXX pattern (adds "1" before
any tier check), the area-code/country-code international gates aren't
phone numbers so digit-count doesn't apply, and asterisk.sh/
asterisk-digital-ocean.sh/the vendored base script have no phone-number
comparison logic at all — this class of bug only lives in the PSTN
permission/whitelist layer this project added on top.

services/pstn-trunk.sh

@@ -1666,6 +1666,13 @@ install_pstn-trunk() {
 
     local TRUNK_DID=""
     prompt_text "DID (the 10-digit US phone number assigned to this trunk, digits only):" "" TRUNK_DID
+    # Accept an 11-digit entry (leading "1") too and strip it — every other
+    # DID/number field in this system (personal_did, allowed_numbers) has
+    # the same 10-vs-11-digit ambiguity, and rejecting a plainly-valid
+    # 11-digit number here just to force a re-prompt is needless friction.
+    if [[ "$TRUNK_DID" =~ ^1([0-9]{10})$ ]]; then
+        TRUNK_DID="${BASH_REMATCH[1]}"
+    fi
     if [[ ! "$TRUNK_DID" =~ ^[0-9]{10}$ ]]; then
         log_error "That doesn't look like a 10-digit US number — aborting."
         return 1