Admit kiosk callers by network position, not only by device token

The device token assumes a handful of fixed screens an administrator
provisions once. That is not how these kiosks are used: most people open the
page on their own PC, and there is no login, so per-browser provisioning would
mean touching every PC on the floor and losing it again on the next reimage or
cleared profile. A screen in that state did not look refused either - the USB
kiosk rendered a working page whose every call answered 404.

Both kiosks now admit a caller on either ground, the same shape the GE-Enforce
client endpoints already use: the per-device token, or a source address inside
an allowlist. Wall screens keep the token and are not confined to the
allowlist; everyone else is admitted by where they are on the network. Still
gated on the site's enable flag, so nothing opens by itself, and both
allowlists ship empty - token-only until a site enters its ranges.

- shopdb.api gains ip_in_cidrs and request_ip_allowlisted (contract 0.35.0).
  On the surface because both plugins need the identical gate, and a CIDR
  parser copied into two of them is where a fail-open creeps in later. They
  fail closed on an empty setting, an unparseable caller address and a
  malformed entry, and they read remote_addr rather than raw X-Forwarded-For -
  so the IIS rewrite rule is what makes them meaningful, which the module says
  at length.
- Separate settings per kiosk, usb_kiosk_allowed_cidrs and
  printedparts_kiosk_allowed_cidrs. One must not grant the other, for the same
  reason the tokens are separate.
- Both settings pages get a picker listing the network plugin's subnets with
  their VLANs. It stores resolved CIDR strings, not subnet ids: the setting has
  to work at a site that does not run that plugin and must not break when an
  inventory row is deleted. Entries matching no subnet are shown rather than
  hidden, since a stale one left by an inventory edit looks exactly like a
  hand-typed range.
- USBKiosk says it was not admitted instead of pretending to work, which
  PartsKiosk already did.
- The USB settings page keyed text-vs-boolean off the token alone. Adding a
  second text setting to the boolean path would have saved it as the word
  'true' - the bug that replaced the kiosk token and 404'd every provisioned
  screen. Both load and save now key off a list, with a spec on it.

The trade, stated plainly in the admin UI: anyone on an allowed network can
check a drive in or out against a badge number they guess, and the record
carries that person's name. Badges are attribution, not authorization. Keeping
the ranges narrow is what bounds it; login is the alternative and was ruled out
because these users do not sign in.

plugins/printedparts/frontend/views/PrintedPartsSettings.vue

@@ -68,6 +68,18 @@
         </p>
       </div>
 
+      <div class="form-group">
+        <label>Networks allowed without the token</label>
+        <NetworkAllowlistPicker v-model="values.printedparts_kiosk_allowed_cidrs" />
+        <p class="field-hint">
+          For people who open the kiosk on their own PC rather than at the
+          screen. A browser on one of these networks is admitted with no token
+          and no login, so keep this to the shop-floor ranges. Leave empty to
+          require the token from every caller. Separate from the USB kiosk
+          allowlist: one does not grant the other.
+        </p>
+      </div>
+
       <div class="form-group">
         <label>Unknown badge at the kiosk</label>
         <select v-model="values.printedparts_unknown_badge" class="form-control">
@@ -143,6 +155,7 @@
 <script setup>
 import { ref, computed, onMounted } from 'vue'
 import { settingsApi, usersApi, supportteamsApi } from '@/api'
+import NetworkAllowlistPicker from '@/components/NetworkAllowlistPicker.vue'
 
 const KEYS = [
   'printedparts_code_prefix',
@@ -150,6 +163,7 @@ const KEYS = [
   'printedparts_default_threshold',
   'printedparts_kiosk_enabled',
   'printedparts_kiosk_token',
+  'printedparts_kiosk_allowed_cidrs',
   'printedparts_unknown_badge',
   'printedparts_alert_email',
   'printedparts_alert_userids',
@@ -163,6 +177,7 @@ const values = ref({
   printedparts_default_threshold: 5,
   printedparts_kiosk_enabled: 'false',
   printedparts_kiosk_token: '',
+  printedparts_kiosk_allowed_cidrs: '',
   printedparts_unknown_badge: 'deny',
   printedparts_alert_email: '',
   printedparts_alert_userids: '',