Add viewer-range categories, nomination tracking, dynamic showact form, session timeout, share URLs, and workflow-per-season

Features:
- Category viewer ranges + subcategory templates (admin group modal, tree workspace)
- Nomination enrichment via TwitchTracker API (NominationEnrichmentService,
  TwitchTrackerViewerStatsProvider) with admin tracking rules editor
- Nomination group tracker: CategoryGroupName as primary identifier,
  CategoryId stays as nullable legacy field; StreamerIdentity table
- Dynamic showact application form builder (AdminShowactFormBuilder,
  ShowactApplicationSchedule)
- Session idle timeout setting (AdminSessionTimeoutCard)
- Share URLs for X and Discord (SiteSettings, public extras)
- Workflow rules now stored per season (falls back to global SiteSettings)
- New admin routes: settings/access, settings/workflows, tracking-rules
- New admin review workspace with subcategory tabs
- AdminCategoriesView rebuilt with group/subcategory modals

Migrations (all additive):
- AddShareUrls, AddShowactDynamicForm, AddCategoryViewerRanges,
  AddSessionIdleTimeoutSettings, AddSeasonSubcategoryTemplates,
  AddNominationGroupTrackerIdentity, AddShowactApplicationSchedule,
  AddSeasonWorkflowRulesJson

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

frontend/src/components/admin/AdminSessionTimeoutCard.vue

@@ -0,0 +1,46 @@
+<script setup lang="ts">
+import { Clock3 } from '@lucide/vue'
+
+import type { AdminOperationalSettingsForm } from './adminSettingsTypes'
+
+defineProps<{
+  form: AdminOperationalSettingsForm
+  saving: boolean
+  canManage: boolean
+}>()
+</script>
+
+<template>
+  <section class="rounded-[26px] border border-violet-100 bg-white/85 p-5 shadow-[0_18px_46px_rgba(168,145,214,0.08)]">
+    <div class="flex gap-3">
+      <div class="grid h-12 w-12 shrink-0 place-items-center rounded-2xl bg-violet-100 text-violet-700">
+        <Clock3 class="h-5 w-5" />
+      </div>
+      <div>
+        <p class="text-xs font-semibold uppercase tracking-[0.22em] text-violet-500">Session Timeout</p>
+        <h3 class="mt-1 text-xl font-bold text-slate-900">Automatischer Logout bei Inaktivitaet</h3>
+        <p class="mt-1 text-sm leading-6 text-slate-500">
+          Team- und Admin-Sessions werden nach der eingestellten Zeit ohne Aktivitaet automatisch beendet. Minimum sind 3 Stunden.
+        </p>
+      </div>
+    </div>
+
+    <div class="mt-5 grid gap-4 md:grid-cols-[minmax(0,220px)_1fr] md:items-start">
+      <label class="block">
+        <span class="text-xs font-semibold uppercase tracking-[0.18em] text-slate-500">Inaktiv nach Stunden</span>
+        <input
+          v-model.number="form.sessionIdleTimeoutHours"
+          :disabled="saving || !canManage"
+          type="number"
+          min="3"
+          step="1"
+          inputmode="numeric"
+          class="mt-2 h-12 w-full rounded-2xl border border-violet-200 bg-white px-4 text-sm font-semibold text-slate-800 outline-none transition focus:border-violet-400 focus:ring-4 focus:ring-violet-100 disabled:bg-slate-50 disabled:text-slate-400"
+        />
+      </label>
+      <div class="rounded-2xl border border-violet-100 bg-violet-50/60 px-4 py-3 text-sm leading-6 text-violet-900">
+        Der Logout reagiert auf echte Nutzeraktivitaet wie Klicks, Tasten, Scrollen oder Touch. Die Session bleibt serverseitig trotzdem autoritativ und laeuft spaetestens nach 30 Tagen absolut ab.
+      </div>
+    </div>
+  </section>
+</template>