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>

server/internal/shared/swagger/descriptions.go

@@ -176,15 +176,15 @@ var routeDocs = map[string]routeDoc{
 	"PUT /api/tenant/brands/:id/keywords/:kid":    {"更新关键词", "修改关键词文本/分组。"},
 	"DELETE /api/tenant/brands/:id/keywords/:kid": {"删除关键词", "删除某条关键词。"},
 
-	"GET /api/tenant/brands/:id/questions":                      {"品牌问题列表", "返回品牌下的监控问题，可按 keyword_id 过滤。"},
-	"POST /api/tenant/brands/:id/questions":                     {"新增监控问题", "为品牌添加一条 GEO 监控问题。"},
-	"POST /api/tenant/brands/:id/questions/combination-preview": {"拓词工具预览", "按地域词、前缀词、核心词、行业词、后缀词组合生成问题候选，仅预览不入库。"},
+	"GET /api/tenant/brands/:id/questions":                      {"搜索词列表", "返回品牌下的监控搜索词，可按 keyword_id 过滤。"},
+	"POST /api/tenant/brands/:id/questions":                     {"新增搜索词", "为品牌添加一条 GEO 监控搜索词。"},
+	"POST /api/tenant/brands/:id/questions/combination-preview": {"拓词工具预览", "按地域词、前缀词、精准词、行业词、后缀词组合生成搜索词候选，仅预览不入库。"},
 	"POST /api/tenant/brands/:id/questions/combination-fill":    {"拓词工具 AI 填词", "根据用户 IP 本地识别地域，并结合品牌信息补全拓词工具的五列词组。"},
-	"POST /api/tenant/brands/:id/questions/ai-distill":          {"AI 扩展问题", "围绕品牌和主题生成问题候选，使用结构化输出并按 AI 点计费。"},
-	"POST /api/tenant/brands/:id/questions/classify-metadata":   {"问题元数据分类", "批量为问题文本推断 layer 和 intent 元数据。"},
-	"POST /api/tenant/brands/:id/questions/materialize":         {"保存问题候选", "将用户选中的问题候选保存到当前品牌问题集，执行配额、去重和审计。"},
-	"PUT /api/tenant/brands/:id/questions/:qid":                 {"更新监控问题", "修改问题文本或所属关键词。"},
-	"DELETE /api/tenant/brands/:id/questions/:qid":              {"删除监控问题", "删除某条监控问题。"},
+	"POST /api/tenant/brands/:id/questions/ai-distill":          {"AI 扩展搜索词", "围绕品牌和主题生成搜索词候选，使用结构化输出并按 AI 点计费。"},
+	"POST /api/tenant/brands/:id/questions/classify-metadata":   {"搜索词元数据分类", "批量为搜索词文本推断 layer 和 intent 元数据。"},
+	"POST /api/tenant/brands/:id/questions/materialize":         {"保存搜索词候选", "将用户选中的搜索词候选保存到当前关键词库（搜索词），执行配额、去重和审计。"},
+	"PUT /api/tenant/brands/:id/questions/:qid":                 {"更新监控搜索词", "修改搜索词文本或所属关键词。"},
+	"DELETE /api/tenant/brands/:id/questions/:qid":              {"删除监控搜索词", "删除某条监控搜索词。"},
 
 	"GET /api/tenant/brands/:id/competitors":         {"竞品列表", "返回品牌下登记的竞品。"},
 	"POST /api/tenant/brands/:id/competitors":        {"新增竞品", "为品牌添加竞品记录。"},