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/views/admin/AdminCandidatesView.vue

@@ -25,6 +25,7 @@ const {
   categoryFilterOptions,
   categoryLabelMap,
   duplicateCandidateKeys,
+  candidateIdentitySummaries,
   candidateWorkflowNotices,
   duplicateCandidateCount,
   acceptedCandidateCount,
@@ -41,6 +42,8 @@ const {
   canSave,
   candidatePlatformOptions,
   selectedPlatformValue,
+  editorIdentitySummary,
+  editorRuleNotices,
   acceptanceStatusOptions,
   clipEmbedStatusOptions,
   readinessFilterOptions,
@@ -146,6 +149,7 @@ watchAdminToast(adminMessage, adminError)
         :range-end="rangeEnd"
         :category-label-map="categoryLabelMap"
         :duplicate-candidate-keys="duplicateCandidateKeys"
+        :candidate-identity-summaries="candidateIdentitySummaries"
         :candidate-workflow-notices="candidateWorkflowNotices"
         :acceptance-status-options="acceptanceStatusOptions"
         @edit="openEdit"
@@ -162,6 +166,8 @@ watchAdminToast(adminMessage, adminError)
       :category-options="categoryOptions"
       :candidate-platform-options="candidatePlatformOptions"
       :selected-platform-value="selectedPlatformValue"
+      :identity-summary="editorIdentitySummary"
+      :rule-notices="editorRuleNotices"
       :acceptance-status-options="acceptanceStatusOptions"
       :clip-embed-status-options="clipEmbedStatusOptions"
       :can-save="canSave"