alerts: per-support-team webhook; printedparts routes low-stock to a chosen team

Support teams gain a webhookurl (migration 7d29 + API + settings-page field), so
a team is a notification target. send_webhook(url=) lets a caller override the
site default with a team's webhook. Printedparts gains a 'alert support team'
setting (printedparts_alert_supportteamid) + selector on its settings page;
low-stock alerts post to that team's webhook, falling back to the site
alert_webhook_url. Email leg unchanged. Same pattern extends to other alerting
plugins (printers low-toner next).

plugins/printedparts/frontend/views/PrintedPartsSettings.vue

@@ -76,6 +76,20 @@
         </p>
       </div>
 
+      <div class="form-group">
+        <label>Alert support team (Teams webhook)</label>
+        <select v-model="values.printedparts_alert_supportteamid" class="form-control">
+          <option value="">Site default webhook</option>
+          <option v-for="team in supportTeams" :key="team.supportteamid" :value="String(team.supportteamid)">
+            {{ team.teamname }}{{ team.webhookurl ? '' : ' (no webhook set)' }}
+          </option>
+        </select>
+        <p class="field-hint">
+          Low-stock alerts post to this team's webhook (set on Settings &gt;
+          Support Teams). Empty uses the site-wide alert webhook.
+        </p>
+      </div>
+
       <button class="btn btn-primary" :disabled="saving" @click="save">
         {{ saving ? 'Saving...' : 'Save' }}
       </button>
@@ -85,7 +99,7 @@
 
 <script setup>
 import { ref, onMounted } from 'vue'
-import { settingsApi, usersApi } from '@/api'
+import { settingsApi, usersApi, supportteamsApi } from '@/api'
 
 const KEYS = [
   'printedparts_code_prefix',
@@ -93,7 +107,8 @@ const KEYS = [
   'printedparts_unknown_badge',
   'printedparts_alert_email',
   'printedparts_alert_userids',
-  'printedparts_alert_roleids'
+  'printedparts_alert_roleids',
+  'printedparts_alert_supportteamid'
 ]
 
 const values = ref({
@@ -102,8 +117,10 @@ const values = ref({
   printedparts_unknown_badge: 'deny',
   printedparts_alert_email: '',
   printedparts_alert_userids: '',
-  printedparts_alert_roleids: ''
+  printedparts_alert_roleids: '',
+  printedparts_alert_supportteamid: ''
 })
+const supportTeams = ref([])
 const users = ref([])
 const selectedUserids = ref([])
 const roles = ref([])
@@ -130,6 +147,8 @@ onMounted(async () => {
       .split(',').map(id => id.trim()).filter(Boolean)
     const rolesResponse = await usersApi.roles.list()
     roles.value = rolesResponse.data.data || []
+    const teamsResponse = await supportteamsApi.list()
+    supportTeams.value = teamsResponse.data.data || []
   } catch (loadError) {
     error.value = 'Could not load settings'
     console.error(loadError)