Deltaups voltage divisor for Mini-SNMP firmware (librenms#19797)

* device: deltaups voltage divisor for Mini-SNMP firmware

Delta UPS602R2RT* base stations with the Mini-SNMP firmware report
input / output / bypass voltages in tenths of volts (raw 2302 =
230.2 V) instead of the RFC 1628 whole volts that LibreNMS's stock
get_device_divisor() assumes. With the default behaviour the device
overview shows "2302 V" for a 230 V mains supply.

Verified on UPS602R2RT2N035 with firmware 0F0011BR00.02.03. The
older GES602R212035 with the "UPS SNMP Agent" reports correctly so
the override is narrowed by hardware string prefix
("Delta UPS602R2RT"). The upsBatteryVoltage OID is excluded from
the override because it already uses the RFC 1628 d-1 scale.

Adds tests/snmpsim/deltaups_mini-snmp.snmprec and tests/data/
deltaups_mini-snmp.json capturing the affected hardware so a future
regression would surface in CI. The existing deltaups and
deltaups_rfc1628string fixtures continue to pass (no regression).

  ./lnms dev:check ci -o deltaups
    OS detection ✓
    OS data is valid: deltaups, deltaups_mini-snmp, deltaups_rfc1628string ✓
    OS: deltaups, deltaups_mini-snmp, deltaups_rfc1628string ✓

* device: remove inline comments from deltaups voltage divisor

Author: sergio-scl

includes/discovery/functions.inc.php

@@ -291,6 +291,12 @@ function get_device_divisor($device, $os_version, $sensor_type, $oid)
                 return 1;
             }
         }
+    } elseif ($device['os'] == 'deltaups') {
+        if ($sensor_type == 'voltage'
+            && ! Str::startsWith($oid, '.1.3.6.1.2.1.33.1.2.5.')
+            && Str::startsWith($device['hardware'] ?? '', 'Delta UPS602R2RT')) {
+            return 10;
+        }
     } elseif ($device['os'] == 'huaweiups') {
         if ($sensor_type == 'frequency') {
             if (Str::startsWith($device['hardware'], 'UPS2000')) {