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

web/app/dashboard/channels/_components/edit.tsx

@@ -712,7 +712,7 @@ function WebAccessGuide({ channelId }: { channelId: string }) {
     channelId: "${channelId}"
   };
 </script>
-<script async src="${origin}/sdk/cs-ai-agent-sdk.min.js"></script>`
+<script async src="${origin}/sdk/bosschat-sdk.min.js"></script>`
   }, [channelId, origin])
 
   async function copyText(text: string, successMessage: string) {

web/app/dashboard/conversations/_components/chat-panel.tsx

@@ -343,7 +343,7 @@ export function ChatPanel() {
   const messagesScroll = (
     <div
       ref={messagesContainerRef}
-      className="h-full min-h-0 flex-1 overflow-y-auto p-4 cs-agent-scrollbar"
+      className="h-full min-h-0 flex-1 overflow-y-auto p-4 bosschat-scrollbar"
     >
       <div ref={messagesContentRef} className="flex flex-col">
         {!loading && messages.length > 0 && messagesHasMore ? (

web/app/dashboard/login/page.tsx

@@ -16,7 +16,7 @@ export default function LoginPage() {
             </div>
             <div className="space-y-3">
               <h2 className="max-w-lg text-5xl font-semibold tracking-tight">
-                BoosChat
+                BossChat
               </h2>
               <p className="max-w-xl text-sm leading-6 text-white/72">
                 懂问题，更懂用户；快响应，更能落地。
@@ -49,13 +49,13 @@ export default function LoginPage() {
         <div className="flex justify-center gap-2 md:justify-start">
           <Link href="/dashboard/login" className="flex items-center gap-2 font-medium">
             <img
-              src="/images/logo.svg"
-              alt="BoosChat"
+              src="/images/logo.png"
+              alt="BossChat"
               width="32"
               height="32"
               className="size-7 shrink-0 object-contain"
             />
-            BoosChat
+            BossChat
           </Link>
         </div>
         <div className="flex flex-1 items-center justify-center">

web/app/layout.tsx

@@ -23,8 +23,8 @@ const geistMono = Geist_Mono({
 })
 
 export const metadata: Metadata = {
-  title: "BoosChat",
-  description: "BoosChat 智能客服系统",
+  title: "BossChat",
+  description: "BossChat 智能客服系统",
 }
 
 export default function RootLayout({