feat(keywords): rename brand-question terminology to search-keyword + add entity exclusion

- Rename UI/prompt labels: "品牌主问题" → "优化关键词", "搜索问题" → "搜索词"
- Add brand/competitor entity exclusion filter in question expansion (AI distill path)
- Refactor combination question text normalization, remove manual question-mark appending
- Update prompts to emphasize commercial-intent search queries over editorial phrasing
- Sync prompt changes across server/configs, deploy, and k3s configs
- Update i18n, frontend views (BrandQuestionCreate, TemplateWizard), and test fixtures

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

apps/admin-web/src/views/TemplateWizardView.vue

@@ -286,6 +286,12 @@ const templateMeta = computed(() => {
 const selectedBrand = computed(
   () => brandsQuery.data.value?.find((brand) => brand.id === selectedBrandId.value) ?? null,
 )
+const brandNameOptions = computed(() =>
+  (brandsQuery.data.value ?? []).map((item) => ({
+    label: item.name,
+    value: item.name,
+  })),
+)
 
 function findQuestionById(id: number | null): Question | null {
   if (!id) {
@@ -654,6 +660,23 @@ watch(supplementalQuestionIds, (ids) => {
   }
 })
 
+function handleBrandNameInput(value: string): void {
+  brandName.value = value
+  const matchedBrand = brandsQuery.data.value?.find((item) => item.name === value)
+  selectedBrandId.value = matchedBrand?.id ?? null
+}
+
+function handleBrandNameSelect(value: string): void {
+  const brand = brandsQuery.data.value?.find((item) => item.name === value)
+  if (!brand) {
+    selectedBrandId.value = null
+    brandName.value = value
+    return
+  }
+  selectedBrandId.value = brand.id
+  brandName.value = brand.name
+}
+
 watch(selectedBrandId, async (brandId) => {
   if (restoringDraft.value) {
     return
@@ -1192,8 +1215,9 @@ function sanitizeLegacyKeywordCopy(copy: TemplateCardCopy): TemplateCardCopy {
 
 function sanitizeLegacyKeywordText(value: string | undefined): string {
   return (value || '')
-    .replace(/核心关键词/g, '品牌主问题')
-    .replace(/关键词/g, '品牌问题')
+    .replace(/品牌主问题/g, '优化关键词')
+    .replace(/补充覆盖问题/g, '补充关键词')
+    .replace(/核心关键词/g, '优化关键词')
     .replace(/标题生成/g, '后续生成')
 }
 
@@ -2392,29 +2416,17 @@ function onStructureDragEnd(): void {
                 />
               </div>
 
-              <div class="field-item">
-                <label>{{ t('templates.wizard.sections.brandLibrary') }}</label>
-                <a-select
-                  v-model:value="selectedBrandId"
-                  allow-clear
-                  show-search
-                  :placeholder="t('templates.wizard.placeholders.brandLibrary')"
-                  :options="
-                    (brandsQuery.data.value || []).map((item) => ({
-                      label: item.name,
-                      value: item.id,
-                    }))
-                  "
-                />
-              </div>
-
               <div class="field-item">
                 <label class="required-asterisk">
                   {{ t('templates.wizard.sections.brandName') }}
                 </label>
-                <a-input
+                <a-auto-complete
                   v-model:value="brandName"
+                  allow-clear
+                  :options="brandNameOptions"
                   :placeholder="t('templates.wizard.placeholders.brandName')"
+                  @change="handleBrandNameInput"
+                  @select="handleBrandNameSelect"
                 />
               </div>