refactor: unified brand naming to BoosChat

Rebrand all user-facing product name references from legacy
Chinese name to unified "BoosChat" across frontend components,
metadata, test fixtures, and documentation.

cmd/testdata/channel/init.go

@@ -66,7 +66,7 @@ func buildSeedItems(aiAgentID int64) []models.Channel {
 			AIAgentID:   aiAgentID,
 			ConfigJSON: jsons.ToJsonStr(dto.WebChannelConfig{
 				Title:      "在线客服",
-				Subtitle:   "贝壳AI提供技术支持",
+				Subtitle:   "BoosChat 提供技术支持",
 				ThemeColor: "#2563eb",
 				Position:   "right",
 				Width:      "780px",

cmd/testdata/kb/kb.go

@@ -152,10 +152,10 @@ func ensureKnowledgeBase(db *gorm.DB) (*models.KnowledgeBase, error) {
 
 func ensureFAQKnowledgeBase(db *gorm.DB) (*models.KnowledgeBase, error) {
 	now := time.Now()
-	item := repositories.KnowledgeBaseRepository.FindOne(db, sqls.NewCnd().Eq("name", "贝壳客服平台 FAQ"))
+	item := repositories.KnowledgeBaseRepository.FindOne(db, sqls.NewCnd().Eq("name", "BoosChat 客服平台 FAQ"))
 	if item == nil {
 		item = &models.KnowledgeBase{
-			Name:                  "贝壳客服平台 FAQ",
+			Name:                  "BoosChat 客服平台 FAQ",
 			Description:           "模拟真实客服场景的 FAQ 测试数据，覆盖账号、坐席、机器人、知识库、工单、计费与发票等常见问题。",
 			KnowledgeType:         string(enums.KnowledgeBaseTypeFAQ),
 			Status:                enums.StatusOk,

cmd/testdata/quickreply/init.go

@@ -22,7 +22,7 @@ func Init() error {
 			id:        1,
 			groupName: "新客接待",
 			title:     "首次接入欢迎语",
-			content:   "您好，欢迎来到贝壳AI客服中心，我是今天为您服务的顾问。您可以直接告诉我您想了解的产品、价格或接入方式，我这边先帮您快速判断。",
+			content:   "您好，欢迎来到 BoosChat 客服中心，我是今天为您服务的顾问。您可以直接告诉我您想了解的产品、价格或接入方式，我这边先帮您快速判断。",
 			status:    enums.StatusOk,
 			sortNo:    100,
 		},

cmd/testdata/tag/init.go

@@ -17,11 +17,11 @@ func Init() error {
 		sortNo   int
 	}{
 		{1, 0, "售前", 1},
-		{2, 1, "贝壳AI", 1},
+		{2, 1, "BoosChat", 1},
 		{3, 2, "产品咨询", 1},
 		{4, 2, "购买意向", 1},
 		{5, 0, "售后", 2},
-		{6, 5, "贝壳AI", 1},
+		{6, 5, "BoosChat", 1},
 		{7, 6, "问题反馈", 1},
 		{8, 6, "产品部署", 2},
 		{9, 6, "需求工单", 3},