fix: License key format, login populates license, case-insensitive email

- admin.service.ts: createLicense() now uses CORR-XXXX-XXXX-XXXX format
  instead of raw hex hash
- admin.service.ts: getLicenses() flattens owner_email in response to
  match frontend expected shape
- auth.service.ts: Login/register responses now include full license
  object so frontend can populate auth store
- auth.service.ts: Email lookups are case-insensitive (LOWER()) to
  prevent duplicate accounts from case variations
- LoginView/RegisterView: Call setLicense() after setAuth()
- AdminLicenses: Handle null expires_at (was showing Dec 31, 1969),
  fix nullable types, fix query param name (per_page → limit)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/views/auth/LoginView.vue

@@ -39,6 +39,9 @@ async function handleLogin() {
     }
 
     authStore.setAuth(response)
+    if (response.license) {
+      authStore.setLicense(response.license)
+    }
     router.push('/')
   } catch (err: unknown) {
     if (err instanceof Error) {
@@ -68,6 +71,9 @@ async function handleTotpVerify() {
     })
 
     authStore.setAuth(response)
+    if (response.license) {
+      authStore.setLicense(response.license)
+    }
     router.push('/')
   } catch (err: unknown) {
     totpCode.value = ''

frontend/src/views/auth/RegisterView.vue

@@ -57,6 +57,9 @@ async function handleRegister() {
     })
 
     authStore.setAuth(response)
+    if (response.license) {
+      authStore.setLicense(response.license)
+    }
     router.push('/setup')
   } catch (err: unknown) {
     if (err instanceof Error) {

frontend/src/views/platform-admin/AdminLicenses.vue

@@ -9,20 +9,20 @@ interface License {
   id: string
   license_key: string
   owner_email: string
-  server_name: string
+  server_name: string | null
   status: 'active' | 'suspended' | 'expired' | 'revoked'
   created_at: string
-  expires_at: string
+  expires_at: string | null
 }
 
 interface LicenseDetail {
   id: string
   license_key: string
   owner_email: string
-  server_name: string
+  server_name: string | null
   status: string
   created_at: string
-  expires_at: string
+  expires_at: string | null
   team_count: number
   wipe_count: number
   server_connection: {
@@ -67,8 +67,11 @@ const statusBadgeClass: Record<string, string> = {
   revoked: 'bg-red-500/10 text-red-400',
 }
 
-function formatDate(iso: string): string {
-  return new Date(iso).toLocaleDateString('en-US', {
+function formatDate(iso: string | null | undefined): string {
+  if (!iso) return '—'
+  const d = new Date(iso)
+  if (isNaN(d.getTime()) || d.getTime() === 0) return '—'
+  return d.toLocaleDateString('en-US', {
     month: 'short',
     day: 'numeric',
     year: 'numeric',
@@ -80,7 +83,7 @@ async function fetchLicenses() {
   try {
     const params = new URLSearchParams({
       page: page.value.toString(),
-      per_page: perPage.toString(),
+      limit: perPage.toString(),
     })
     if (searchQuery.value.trim()) params.set('search', searchQuery.value.trim())
     if (statusFilter.value !== 'all') params.set('status', statusFilter.value)