feat(fc2b): Settings Maintenance tab

MaintenancePanel hosts: backfill + centroid recompute trigger cards,
the five suggestion-threshold sliders (autosave on slider release),
the allowlist table (inline editable min_confidence, delete), and the
alias table (mapping display, delete). Wired as a third Settings tab,
ML settings loaded lazily when the tab opens.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/components/settings/CentroidRecomputeCard.vue

@@ -0,0 +1,30 @@
+<template>
+  <v-card>
+    <v-card-title>Tag centroids</v-card-title>
+    <v-card-text>
+      <p class="text-body-2 mb-3">
+        Rebuild the per-tag SigLIP centroids that power similarity-based
+        suggestions. Runs nightly automatically; trigger manually after a
+        large tagging session.
+      </p>
+      <v-btn color="primary" rounded="pill" :loading="busy" @click="run">
+        <v-icon start>mdi-vector-triangle</v-icon> Recompute centroids
+      </v-btn>
+      <span v-if="done" class="ml-3 text-caption">Enqueued.</span>
+    </v-card-text>
+  </v-card>
+</template>
+
+<script setup>
+import { ref } from 'vue'
+import { useMLStore } from '../../stores/ml.js'
+const store = useMLStore()
+const busy = ref(false)
+const done = ref(false)
+async function run() {
+  busy.value = true
+  try { await store.triggerRecomputeCentroids(); done.value = true }
+  catch (e) { window.__fcToast?.({ text: e.message, type: 'error' }) }
+  finally { busy.value = false }
+}
+</script>