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

internal/wxwork/login.go

@@ -4,8 +4,8 @@ import (
 	"crypto/hmac"
 	"crypto/rand"
 	"crypto/sha256"
-	"cs-agent/internal/pkg/dto/response"
-	"cs-agent/internal/pkg/errorsx"
+	"bosschat/internal/pkg/dto/response"
+	"bosschat/internal/pkg/errorsx"
 	"encoding/base64"
 	"encoding/hex"
 	"encoding/json"

internal/wxwork/wxwork.go

@@ -1,7 +1,7 @@
 package wxwork
 
 import (
-	"cs-agent/internal/pkg/config"
+	"bosschat/internal/pkg/config"
 	"strings"
 
 	"github.com/silenceper/wechat/v2/cache"