Improve admin candidate modal UX and add clip menu visibility toggle

- Widen AdminCandidateEditorModal to size lg for better readability
- Rename "Clip-Compilation" section to "Clip / Compilation", update copy to reflect single clips too, drop upload hint and Clip-Plattform field, rename label to "Link"
- Fix NativeSelect dropdown clipping inside overflow-y-auto modals by teleporting the menu to body with fixed positioning, flip-up logic, and dynamic maxHeight capped to viewport
- Add ClipAdminMenuVisible setting (backend domain, contracts, endpoint, migration) with matching frontend types, defaults, form wiring, and toggle in the Clip-Workflow modal — hides the Clips nav item from the admin sidebar when disabled

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

frontend/src/components/admin/AdminReviewDecisionPanel.vue

@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { CheckCircle2, Trash2 } from '@lucide/vue'
+import { Ban, CheckCircle2, Loader2, Trash2 } from '@lucide/vue'
 
 import Button from '../ui/Button.vue'
 import NativeSelect from '../ui/NativeSelect.vue'
@@ -24,6 +24,7 @@ defineProps<{
   } | null
   streamUrl?: string
   canApproveSelected: boolean
+  blacklistSaving: boolean
   selectedPlatformValue: (platform: string) => string
 }>()
 
@@ -31,6 +32,7 @@ const emit = defineEmits<{
   'platform-change': [value: string]
   approve: [nominationId: number]
   reject: [nominationId: number]
+  'blacklist-link': [streamUrl: string]
 }>()
 </script>
 
@@ -51,14 +53,28 @@ const emit = defineEmits<{
 
     <div v-if="streamUrl" class="mt-5 rounded-2xl border border-sky-100 bg-sky-50/70 p-4">
       <p class="text-xs font-semibold uppercase tracking-[0.18em] text-sky-700">Eingereichter Stream-Link</p>
-      <a
-        :href="streamUrl"
-        target="_blank"
-        rel="noopener"
-        class="mt-2 inline-flex max-w-full items-center rounded-full border border-sky-200 bg-white px-3 py-1.5 text-sm font-semibold text-sky-800 underline-offset-4 hover:underline"
-      >
-        <span class="truncate">{{ streamUrl }}</span>
-      </a>
+      <div class="mt-2 flex flex-wrap items-center gap-2">
+        <a
+          :href="streamUrl"
+          target="_blank"
+          rel="noopener"
+          class="inline-flex max-w-full items-center rounded-full border border-sky-200 bg-white px-3 py-1.5 text-sm font-semibold text-sky-800 underline-offset-4 hover:underline"
+        >
+          <span class="truncate">{{ streamUrl }}</span>
+        </a>
+        <Button
+          type="button"
+          variant="ghost"
+          size="sm"
+          class="gap-2 rounded-full border-rose-200 bg-white px-3 text-rose-700 hover:bg-rose-50 hover:text-rose-800"
+          :disabled="blacklistSaving"
+          @click="emit('blacklist-link', streamUrl)"
+        >
+          <Loader2 v-if="blacklistSaving" class="h-3.5 w-3.5 animate-spin" />
+          <Ban v-else class="h-3.5 w-3.5" />
+          {{ blacklistSaving ? 'Blockiert ...' : 'Zur Blacklist' }}
+        </Button>
+      </div>
     </div>
 
     <div v-if="signalSummary" class="mt-4 grid gap-3 sm:grid-cols-3">