refactor: rebrand from cs-agent to BossChat

- Rename Go module: cs-agent → bosschat
- Rename all import paths across 200+ Go files
- Rename SDK: cs-ai-agent-sdk → bosschat-sdk
- Rename message protocol: cs-agent:* → bosschat:*
- Rename JS globals: CSAgentConfig → BossChatConfig
- Rename CSS classes: cs-agent-* → bosschat-*
- Update Makefile APP_NAME and ARCHIVE_NAME
- Update logo assets
- Fix display name: BoosChat → BossChat

cmd/testdata/tag/init.go

@@ -1,9 +1,9 @@
 package tag
 
 import (
-	"cs-agent/internal/models"
-	"cs-agent/internal/pkg/enums"
-	"cs-agent/internal/repositories"
+	"bosschat/internal/models"
+	"bosschat/internal/pkg/enums"
+	"bosschat/internal/repositories"
 	"time"
 
 	"github.com/mlogclub/simple/sqls"
@@ -17,11 +17,11 @@ func Init() error {
 		sortNo   int
 	}{
 		{1, 0, "售前", 1},
-		{2, 1, "BoosChat", 1},
+		{2, 1, "BossChat", 1},
 		{3, 2, "产品咨询", 1},
 		{4, 2, "购买意向", 1},
 		{5, 0, "售后", 2},
-		{6, 5, "BoosChat", 1},
+		{6, 5, "BossChat", 1},
 		{7, 6, "问题反馈", 1},
 		{8, 6, "产品部署", 2},
 		{9, 6, "需求工单", 3},