feat(fc2b): ml / allowlist / aliases Pinia stores

Thin wrappers over the FC-2b API: ml (settings GET/PATCH, backfill +
recompute triggers), allowlist (list, threshold patch, remove with
optimistic local update), aliases (list, remove with optimistic update).

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

frontend/src/stores/aliases.js

@@ -0,0 +1,26 @@
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+import { useApi } from '../composables/useApi.js'
+
+export const useAliasesStore = defineStore('aliases', () => {
+  const api = useApi()
+  const rows = ref([])
+  const loading = ref(false)
+
+  async function load() {
+    loading.value = true
+    try { rows.value = await api.get('/api/aliases') }
+    finally { loading.value = false }
+  }
+
+  async function remove(aliasString, aliasCategory) {
+    await api.delete(
+      `/api/aliases/${encodeURIComponent(aliasString)}/${encodeURIComponent(aliasCategory)}`
+    )
+    rows.value = rows.value.filter(
+      r => !(r.alias_string === aliasString && r.alias_category === aliasCategory)
+    )
+  }
+
+  return { rows, loading, load, remove }
+})