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/useAdminWorkflowRules.ts

@@ -1,4 +1,4 @@
-import { computed, onMounted, ref } from 'vue'
+import { computed, onMounted, ref, watch } from 'vue'
 
 import { useAwardsStore } from '../../stores/awards'
 import type { AdminWorkflowRule } from '../../types/awards'
@@ -18,6 +18,7 @@ function normalizeRule(rule: AdminWorkflowRule): AdminWorkflowRule {
 
 export function useAdminWorkflowRules() {
   const store = useAwardsStore()
+  const selectedSeasonId = computed(() => store.adminSelectedSeasonId)
   const workflowLoading = ref(false)
   const workflowSaving = ref(false)
   const workflowError = ref('')
@@ -81,6 +82,11 @@ export function useAdminWorkflowRules() {
   }
 
   onMounted(loadWorkflowRules)
+  watch(selectedSeasonId, (next, previous) => {
+    if (next && next !== previous) {
+      void loadWorkflowRules()
+    }
+  })
 
   return {
     hasUnsavedWorkflowRuleChanges,