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/pkg/dto/request/admin_request.go

@@ -1,6 +1,6 @@
 package request
 
-import "cs-agent/internal/pkg/enums"
+import "bosschat/internal/pkg/enums"
 
 type RevokeSessionRequest struct {
 	ID int64 `json:"id"`

internal/pkg/dto/request/agent_request.go

@@ -1,6 +1,6 @@
 package request
 
-import "cs-agent/internal/pkg/enums"
+import "bosschat/internal/pkg/enums"
 
 type CreateAgentProfileRequest struct {
 	UserID                int64               `json:"userId"`

internal/pkg/dto/request/ai_request.go

@@ -1,6 +1,6 @@
 package request
 
-import "cs-agent/internal/pkg/enums"
+import "bosschat/internal/pkg/enums"
 
 type AIAgentMCPToolRequest struct {
 	ToolCode    string            `json:"toolCode"`

internal/pkg/dto/request/knowledge_request.go

@@ -1,6 +1,6 @@
 package request
 
-import "cs-agent/internal/pkg/enums"
+import "bosschat/internal/pkg/enums"
 
 type CreateKnowledgeBaseRequest struct {
 	Name                  string  `json:"name"`

internal/pkg/dto/request/message_request.go

@@ -1,6 +1,6 @@
 package request
 
-import "cs-agent/internal/pkg/enums"
+import "bosschat/internal/pkg/enums"
 
 type MessageListRequest struct {
 	ConversationID int64  `json:"conversationId"`

internal/pkg/dto/request/quick_reply_request.go

@@ -1,6 +1,6 @@
 package request
 
-import "cs-agent/internal/pkg/enums"
+import "bosschat/internal/pkg/enums"
 
 type QuickReplyListRequest struct {
 	GroupName string `json:"groupName"`