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/generator/generator.go

@@ -1,7 +1,7 @@
 package main
 
 import (
-	"cs-agent/internal/models"
+	"bosschat/internal/models"
 
 	"github.com/mlogclub/codegen"
 )
@@ -10,7 +10,7 @@ func main() {
 	codegen.GenerateWithOption(
 		codegen.Options{
 			BaseDir:    "./",
-			PkgName:    "cs-agent",
+			PkgName:    "bosschat",
 			Version:    1,
 			Repository: true,
 			Service:    true,