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/views/admin/AdminWinnersView.vue

@@ -23,6 +23,7 @@ const {
   winnerSelections,
   clearWinner,
   saveWinner,
+  winnerRuleNoticeFor,
 } = useAdminWinnersManager()
 
 watchAdminToast(adminMessage, adminError)
@@ -131,20 +132,36 @@ watchAdminToast(adminMessage, adminError)
             </p>
           </div>
 
-          <NativeSelect
-            v-model="winnerSelections[row.category.id]"
-            :disabled="row.isEmpty"
-            :options="[
-              { label: 'Bitte Gewinner waehlen', value: '' },
-              ...row.candidates.map((candidate) => ({
-                label: `${candidate.displayName} · ${candidate.channelSlug} · ${candidate.platform}`,
-                value: `${candidate.id}`,
-              })),
-            ]"
-          />
+          <div class="min-w-0 space-y-2">
+            <NativeSelect
+              v-model="winnerSelections[row.category.id]"
+              :disabled="row.isEmpty"
+              :options="[
+                { label: 'Bitte Gewinner waehlen', value: '' },
+                ...row.candidates.map((candidate) => ({
+                  label: `${candidate.displayName} · ${candidate.channelSlug} · ${candidate.platform} · ${candidate.clipCompilationUrl ? 'Clip gepflegt' : 'kein Clip'}`,
+                  value: `${candidate.id}`,
+                })),
+              ]"
+            />
+
+            <p
+              v-if="winnerRuleNoticeFor(row.category.id)"
+              class="rounded-2xl border px-3 py-2 text-sm font-semibold"
+              :class="winnerRuleNoticeFor(row.category.id)?.mode === 'block'
+                ? 'border-rose-100 bg-rose-50 text-rose-700'
+                : 'border-amber-100 bg-amber-50 text-amber-700'"
+            >
+              {{ winnerRuleNoticeFor(row.category.id)?.mode === 'block' ? 'Blockiert' : 'Warnung' }}:
+              {{ winnerRuleNoticeFor(row.category.id)?.message }}
+            </p>
+          </div>
 
           <div class="flex flex-wrap justify-end gap-2">
-            <Button :disabled="savingResultForCategory === row.category.id || row.isEmpty || !winnerSelections[row.category.id]" @click="saveWinner(row.category.id)">
+            <Button
+              :disabled="savingResultForCategory === row.category.id || row.isEmpty || !winnerSelections[row.category.id] || winnerRuleNoticeFor(row.category.id)?.mode === 'block'"
+              @click="saveWinner(row.category.id)"
+            >
               {{ savingResultForCategory === row.category.id ? 'Speichert ...' : row.existing ? 'Aktualisieren' : 'Setzen' }}
             </Button>
             <Button