feat(brand): workspace 组件接入品牌文案和 Logo 切换

- layout.tsx: 包裹 BrandProvider + BrandSessionInitializer，SidebarProvider 注入 rootClassName
- welcome.tsx: copy.productLabel 替代硬编码，appLogoSrc 条件渲染 Image/文字
- workspace-header.tsx: 侧边栏折叠时显示品牌缩写，展开时显示 Logo 或 appName

frontend/src/app/workspace/layout.tsx

@@ -14,12 +14,25 @@ import { SidebarInset, SidebarProvider } from "@/components/ui/sidebar";
 import { Toaster } from "@/components/ui/sonner";
 import { CommandPalette } from "@/components/workspace/command-palette";
 import { WorkspaceSidebar } from "@/components/workspace/workspace-sidebar";
+import { BrandProvider, useBrand } from "@/core/brand/provider";
+import { BrandSessionInitializer } from "@/core/brand/provider-client";
 import { getLocalSettings, useLocalSettings } from "@/core/settings";
+import { cn } from "@/lib/utils";
 
 const queryClient = new QueryClient();
 
 export default function WorkspaceLayout({
   children,
+}: Readonly<{ children: React.ReactNode }>) {
+  return (
+    <BrandProvider>
+      <WorkspaceBrandShell>{children}</WorkspaceBrandShell>
+    </BrandProvider>
+  );
+}
+
+function WorkspaceBrandShell({
+  children,
 }: Readonly<{ children: React.ReactNode }>) {
   const [settings, setSettings] = useLocalSettings();
   const [open, setOpen] = useState(false); // SSR default: open (matches server render)
@@ -27,6 +40,7 @@ export default function WorkspaceLayout({
   const pressedKeysRef = useRef<Set<string>>(new Set());
   const comboTriggeredRef = useRef(false);
   const searchParams = useSearchParams();
+  const { rootClassName } = useBrand();
 
   // iframe 技能模式（mode=skill）时隐藏侧边栏
   const isSkillMode = searchParams.get("mode") === "skill";
@@ -110,8 +124,9 @@ export default function WorkspaceLayout({
   );
   return (
     <QueryClientProvider client={queryClient}>
+      <BrandSessionInitializer />
       <SidebarProvider
-        className="h-screen"
+        className={cn("h-screen", rootClassName)}
         open={open}
         onOpenChange={handleOpenChange}
       >

frontend/src/components/workspace/welcome.tsx

@@ -1,8 +1,10 @@
 "use client";
 
+import Image from "next/image";
 import { useSearchParams } from "next/navigation";
 import { useMemo } from "react";
 
+import { useBrand } from "@/core/brand/provider";
 import { useI18n } from "@/core/i18n/hooks";
 import { cn } from "@/lib/utils";
 
@@ -16,6 +18,7 @@ export function Welcome({
   mode?: "ultra" | "pro" | "thinking" | "flash";
 }) {
   const { t } = useI18n();
+  const { copy } = useBrand();
   const searchParams = useSearchParams();
   const isUltra = useMemo(() => mode === "ultra", [mode]);
   const colors = useMemo(() => {
@@ -39,12 +42,37 @@ export function Welcome({
             className="flex items-center gap-2"
             style={{ fontFamily: '"Microsoft YaHei"' }}
           >
-            <AuroraText
+            {/* <AuroraText
               className="text-center text-[18px] leading-normal font-normal"
               colors={colors}
             >
-              {t.welcome.greeting}
-            </AuroraText>
+              {copy.productLabel}
+            </AuroraText> */}
+            <span className="text-[18px] font-normal text-foreground/70">
+              {copy.productLabel}
+            </span>
+
+            <span className="text-[18px] font-normal text-foreground/70">
+              ·
+            </span>
+            {copy.appLogoSrc ? (
+              <Image
+                src={copy.appLogoSrc}
+                alt={copy.appLogoAlt ?? copy.appName}
+                width={104}
+                height={16}
+                draggable={false}
+                // className="h-[16px] w-auto"
+                priority
+              />
+            ) : (
+              <AuroraText
+                className="text-center text-[18px] leading-normal font-normal"
+                colors={colors}
+              >
+                {copy.appName}
+              </AuroraText>
+            )}
           </div>
         )}
       </div>
@@ -59,7 +87,8 @@ export function Welcome({
           )}
         </div>
       ) : (
-        <div> </div>
+        // <div> </div>
+        <></>
       )}
     </div>
   );

frontend/src/components/workspace/workspace-header.tsx

@@ -1,6 +1,7 @@
 "use client";
 
 import { MessageSquarePlus } from "lucide-react";
+import Image from "next/image";
 import Link from "next/link";
 import { usePathname } from "next/navigation";
 import { toast } from "sonner";
@@ -13,6 +14,7 @@ import {
   useSidebar,
 } from "@/components/ui/sidebar";
 import { useThreadChat } from "@/components/workspace/chats";
+import { useBrand } from "@/core/brand/provider";
 import { useI18n } from "@/core/i18n/hooks";
 import { POST_MESSAGE_TYPES, sendToParent } from "@/core/iframe-messages";
 import { env } from "@/env";
@@ -21,10 +23,14 @@ import { copyToClipboard } from "@/lib/utils";
 
 export function WorkspaceHeader({ className }: { className?: string }) {
   const { t } = useI18n();
+  const { copy } = useBrand();
   const { state } = useSidebar();
   const pathname = usePathname();
   const { threadId } = useThreadChat();
   const threadUrl = threadId ? `/workspace/chats/${threadId}` : "";
+  const compactAppName = copy.appName.startsWith("cox")
+    ? `C${copy.appName.charAt(3).toUpperCase()}`
+    : copy.appName.slice(0, 2).toUpperCase();
 
   const handleCopyThreadId = async () => {
     if (!threadId) return;
@@ -51,7 +57,7 @@ export function WorkspaceHeader({ className }: { className?: string }) {
         {state === "collapsed" ? (
           <div className="group-has-data-[collapsible=icon]/sidebar-wrapper:-translate-y flex w-full cursor-pointer items-center justify-center">
             <div className="text-primary block pt-1 font-serif group-hover/workspace-header:hidden">
-              XC
+              {compactAppName}
             </div>
             <SidebarTrigger className="hidden pl-2 group-hover/workspace-header:block" />
           </div>
@@ -62,9 +68,19 @@ export function WorkspaceHeader({ className }: { className?: string }) {
                 {t.workspaceHeader.sidebarTitle}
               </Link>
             ) : (
-              <div className="text-primary ml-2 cursor-default font-serif">
-                {/* TODO: 测试标识 */}
-                XClaw{" "}
+              <div className="text-primary ml-2 flex cursor-default items-center gap-2 font-serif">
+                {copy.appLogoSrc ? (
+                  <Image
+                    src={copy.appLogoSrc}
+                    alt={copy.appLogoAlt ?? copy.appName}
+                    width={104}
+                    height={16}
+                    className="h-4 w-auto"
+                    priority
+                  />
+                ) : (
+                  copy.appName
+                )}
                 <span className="text-sm text-ws-text-subtle-strong">v3.3.0 </span>{" "}
                 <span
                   className={cn(
@@ -80,7 +96,6 @@ export function WorkspaceHeader({ className }: { className?: string }) {
                 >
                   id:{threadId ? threadId.slice(0, 5) : "-"}
                 </span>
-                {" "}
                 {threadId && (
                   <a
                     href={threadUrl}