Align backend with frontend, make clips end-to-end, polish admin

Backend
- Add ClipSubmission entity + table (runtime bootstrapper) and
  POST /api/public/clips (server-derives platform from the link)
- Surface clip submissions in the admin season detail
- Add DELETE candidate/category/clip endpoints with audit entries

Frontend
- Clips admin: real moderation view (list, open link, delete) instead
  of placeholder; wired clipSubmissions through types/api/store
- Categories admin: add delete with confirm modal (matches Candidates)
- Voting ranking bar uses the unified purple gradient
- Fix ASCII transliterations to proper German umlauts across admin
- Remove orphan AdminView 2.vue

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/views/admin/AdminUsersLogsView.vue

@@ -40,7 +40,7 @@ const adminCounts = computed(() => {
   return [...counts.entries()].map(([admin, count]) => ({ admin, count }))
 })
 const logStats = computed(() => [
-  { label: 'Audit-Eintraege', value: auditEntries.value.length },
+  { label: 'Audit-Einträge', value: auditEntries.value.length },
   { label: 'Admins aktiv', value: adminCounts.value.length },
   { label: 'Risk-User', value: new Set(riskFlags.value.map((flag) => flag.twitchUserId).filter(Boolean)).size },
 ])
@@ -51,7 +51,7 @@ const logStats = computed(() => [
     <AdminPageHeader
       eyebrow="User & Logs"
       title="User-Spuren und Admin-Aktionen"
-      description="Eine kompakte Kontrollansicht fuer Audit-Eintraege, auffaellige User und Admin-Aktivitaet. Fuer Detailentscheidungen bleibt Risiko & Audit der Hauptbereich."
+      description="Eine kompakte Kontrollansicht für Audit-Einträge, auffällige User und Admin-Aktivität. Fuer Detailentscheidungen bleibt Risiko & Audit der Hauptbereich."
       :icon="UserCog"
     />
 
@@ -73,14 +73,14 @@ const logStats = computed(() => [
     <section class="grid gap-6 xl:grid-cols-[0.86fr_1.14fr]">
       <Card class="p-6">
         <p class="text-xs font-semibold uppercase tracking-[0.24em] text-violet-500">Admins</p>
-        <h2 class="mt-2 font-[Cormorant_Garamond] text-4xl text-violet-800">Aktivitaet</h2>
+        <h2 class="mt-2 font-[Cormorant_Garamond] text-4xl text-violet-800">Aktivität</h2>
         <div class="mt-5 space-y-3">
           <div v-for="item in adminCounts" :key="item.admin" class="flex items-center justify-between rounded-2xl border border-violet-100 bg-white/90 px-4 py-3">
             <span class="font-semibold text-slate-900">{{ item.admin }}</span>
             <span class="rounded-full bg-violet-50 px-3 py-1 text-sm font-semibold text-violet-700">{{ item.count }}</span>
           </div>
           <p v-if="adminCounts.length === 0" class="rounded-2xl border border-dashed border-violet-100 px-4 py-8 text-center text-sm text-slate-500">
-            Noch keine Admin-Aktivitaet vorhanden.
+            Noch keine Admin-Aktivität vorhanden.
           </p>
         </div>
       </Card>
@@ -100,7 +100,7 @@ const logStats = computed(() => [
               <span class="text-sm text-slate-500">{{ new Date(entry.createdAt).toLocaleString('de-DE') }}</span>
             </div>
           </div>
-          <p v-if="filteredAuditEntries.length === 0" class="px-5 py-10 text-center text-sm text-slate-500">Keine Log-Eintraege gefunden.</p>
+          <p v-if="filteredAuditEntries.length === 0" class="px-5 py-10 text-center text-sm text-slate-500">Keine Log-Einträge gefunden.</p>
         </div>
       </Card>
     </section>
@@ -112,7 +112,7 @@ const logStats = computed(() => [
             <ShieldAlert class="h-5 w-5" />
           </div>
           <div>
-            <p class="text-xs font-semibold uppercase tracking-[0.24em] text-violet-500">Auffaellige User</p>
+            <p class="text-xs font-semibold uppercase tracking-[0.24em] text-violet-500">Auffällige User</p>
             <h2 class="font-[Cormorant_Garamond] text-3xl text-violet-800">Aus Risk-Flags abgeleitet</h2>
           </div>
         </div>
@@ -127,7 +127,7 @@ const logStats = computed(() => [
           <span class="rounded-full border border-rose-100 bg-rose-50 px-3 py-1 text-center text-xs font-semibold uppercase tracking-[0.14em] text-rose-700">{{ user.severity }}</span>
         </div>
         <p v-if="filteredRiskUsers.length === 0" class="px-5 py-10 text-center text-sm text-slate-500">
-          Keine auffaelligen User fuer den aktuellen Filter.
+          Keine auffälligen User für den aktuellen Filter.
         </p>
       </div>
     </Card>