Add email sending (service + 3 flows) and a general asset label generator

Email: a stdlib SMTP mailer (settings-first config, graceful no-op when
unconfigured), a test-email endpoint wired to the Email settings page,
forced first-login password change (users.mustchangepassword, migration
7d23, /change-password flow), new-user welcome mail, and on-demand
report/alert delivery (POST /api/reports/email + Email Report buttons)
with an external-cron-with-a-scoped-PAT path documented for automation.
All tests patch smtplib - no network.

Labels: a shared /print/asset-label/<type>/<id> view any asset detail
page opens - card or plain style, QR or barcode, configurable encoding.
Per-type qr_target_* templates plus label_default_style/codetype/encodes
settings on the Printing page. Measuring-tool labels default to encoding
their inspection-operation code (derived from the location name, e.g.
0615), so every tool in an area shares the area code - verified by
decoding the rendered QR. Machine labels default to the machine number;
blank-serial handled gracefully.

808 tests pass; both features verified live.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/router/index.js

@@ -45,6 +45,13 @@ const routes = [
     component: () => import('../views/Login.vue'),
     meta: { guest: true }
   },
+  // Forced/self-service password change (standalone, authenticated)
+  {
+    path: '/change-password',
+    name: 'change-password',
+    component: () => import('../views/ChangePassword.vue'),
+    meta: { requiresAuth: true }
+  },
   // First-run setup wizard (standalone, admin-only)
   {
     path: '/setup',
@@ -70,6 +77,14 @@ const routes = [
     name: 'print-machine-badge',
     component: () => import('../views/print/MachineBadge.vue')
   },
+  // Shared asset label/code generator for any asset type (public, like the
+  // other /print/* routes). assettype = machine|computer|printer|
+  // network_device|measuring_tool; id = the asset's plugin id.
+  {
+    path: '/print/asset-label/:assettype/:id',
+    name: 'print-asset-label',
+    component: () => import('../views/print/AssetLabel.vue')
+  },
   {
     path: '/print/printer-qr',
     name: 'print-printer-qr-batch',
@@ -115,6 +130,13 @@ router.beforeEach(async (to, from, next) => {
     return next('/')
   }
 
+  // Forced password change: an admin-set temporary password must be replaced
+  // before the user reaches the rest of the app. Let them log out.
+  if (authStore.isAuthenticated && authStore.mustChangePassword
+      && to.path !== '/change-password' && to.path !== '/login') {
+    return next('/change-password')
+  }
+
   // Plugin gating: a disabled backend plugin's frontend routes are dead ends.
   // The enabled list is fetched once and cached; fail-open on error so a blip
   // cannot brick navigation. Works unauthenticated (endpoint is jwt-optional).