feat(questions): make brand questions the primary monitoring & template axis

- add /questions/combination-fill endpoint with AI-driven, IP-region-aware matrix fill
- extract ip2region resolver from ops/app into shared/ipregion for cross-service use
- thread question_id filter through dashboard composite, citation summary, and collect-now
- switch template wizard from keyword inputs to brand-question selection (primary + supplemental)
- pass brand_question and supplemental_questions through assist/title/outline prompts
- add AiWaitingModal + 45s client timeout and request_timeout error mapping for long AI flows

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

apps/admin-web/src/components/AiWaitingModal.vue

@@ -0,0 +1,95 @@
+<script setup lang="ts">
+withDefaults(
+  defineProps<{
+    open: boolean
+    title: string
+    progress: number
+    stage?: string
+    width?: string | number
+  }>(),
+  {
+    stage: '',
+    width: '640px',
+  },
+)
+</script>
+
+<template>
+  <a-modal
+    :open="open"
+    :footer="null"
+    :closable="false"
+    :mask-closable="false"
+    centered
+    :width="width"
+    wrap-class-name="ai-waiting-modal-wrap"
+  >
+    <div class="ai-waiting-modal">
+      <div class="ai-waiting-modal__orb" />
+      <h3>{{ title }}</h3>
+      <a-progress :percent="progress" status="active" :show-info="false" />
+      <p>{{ stage }}</p>
+    </div>
+  </a-modal>
+</template>
+
+<style scoped>
+.ai-waiting-modal {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 24px;
+  padding: 24px 20px 12px;
+  text-align: center;
+}
+
+.ai-waiting-modal__orb {
+  width: 76px;
+  height: 76px;
+  border-radius: 999px;
+  background:
+    radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.92), transparent 38%),
+    conic-gradient(from 120deg, #4f8fff, #7dd3fc, #e879f9, #4f8fff);
+  box-shadow:
+    0 18px 38px rgba(79, 143, 255, 0.2),
+    inset 0 0 18px rgba(255, 255, 255, 0.4);
+  animation: ai-orb-float 2.6s ease-in-out infinite;
+}
+
+.ai-waiting-modal h3 {
+  margin: 0;
+  color: #1b2741;
+  font-size: 22px;
+  font-weight: 700;
+  line-height: 1.35;
+}
+
+.ai-waiting-modal p {
+  min-height: 22px;
+  margin: 0;
+  color: #5f6f8a;
+  font-size: 15px;
+  line-height: 1.5;
+}
+
+@keyframes ai-orb-float {
+  0%,
+  100% {
+    transform: translateY(0) scale(1);
+  }
+  50% {
+    transform: translateY(-6px) scale(1.04);
+  }
+}
+
+@media (max-width: 768px) {
+  .ai-waiting-modal {
+    gap: 20px;
+    padding: 20px 12px 8px;
+  }
+
+  .ai-waiting-modal h3 {
+    font-size: 20px;
+  }
+}
+</style>