启动补丁：乾坤装配参数名、注册接口双前缀、/chat 残留链接清理

- main.py：Executor(sandbox, http_client=…) 参数名与构造签名不符（http=…），致乾坤沙箱装配降级 503——修正
- 注册页手写 fetch 多拼一层 v1（/api/proxy/v1/auth/register → 后端 /api/v1/v1/* 404）；BACKEND_ROOT 已含 /api/v1，proxy 调用不应再带——去掉
- /chat 页 M2b 已随线性会话退役，对话主入口为 /trees（镜树）；六处残留链接（首页/登录/注册跳转/错误页/404 页/管理壳）全部改指 /trees
- 回归：前端 type-check + 203 passed；后端百工+API 套件 45 passed

backend/app/main.py

@@ -114,7 +114,7 @@ async def lifespan(_app: FastAPI) -> AsyncGenerator[None, None]:
         sandbox_http = httpx.AsyncClient(trust_env=False)
         sandbox = SandboxClient(sandbox_http, settings)
         _app.state.baigong_sandbox = sandbox
-        _app.state.baigong_executor = Executor(sandbox, http_client=sandbox_http)
+        _app.state.baigong_executor = Executor(sandbox, http=sandbox_http)
         log_with_context("百工执行器就绪（乾坤沙箱已接入）")
     except Exception as exc:  # noqa: BLE001 — 配置缺失降级，不阻断启动
         _app.state.baigong_sandbox = None

frontend/src/app/(app)/error.tsx

@@ -45,7 +45,7 @@ export default function Error({
           <Button
             variant="secondary"
             size="sm"
-            onClick={() => router.push("/chat")}
+            onClick={() => router.push("/trees")}
           >
             返回对话
           </Button>

frontend/src/app/(app)/not-found.tsx

@@ -13,7 +13,7 @@ export default function NotFound() {
           此处镜面未显影，路径可能已变更或不存在。
         </p>
         <Link
-          href="/chat"
+          href="/trees"
           className="mt-2 inline-flex h-9 items-center rounded-xl bg-patina px-4 text-sm font-medium text-white shadow-lg shadow-patina/25 transition-all hover:bg-patina/90 active:scale-[0.97]"
         >
           返回对话

frontend/src/app/login/page.tsx

@@ -146,7 +146,7 @@ function LoginForm() {
       await login({ username, password });
       setDeparting(true);
       await new Promise((r) => setTimeout(r, 400));
-      const redirect = searchParams.get("redirect") || "/chat";
+      const redirect = searchParams.get("redirect") || "/trees";
       router.push(redirect);
     } catch (err) {
       const msg =

frontend/src/app/page.tsx

@@ -8,7 +8,7 @@ export const dynamic = "force-dynamic";
 
 const QUICK_LINKS = [
   {
-    href: "/chat",
+    href: "/trees",
     label: "对话",
     desc: "与数字生命交谈",
     gradient: "from-patina/20 to-patina/5",

frontend/src/app/register/page.tsx

@@ -91,7 +91,7 @@ function RegisterForm() {
     setError(null);
     try {
       // 调用后端注册端点
-      const resp = await fetch("/api/proxy/v1/auth/register", {
+      const resp = await fetch("/api/proxy/auth/register", {
         method: "POST",
         headers: { "Content-Type": "application/json" },
         body: JSON.stringify({
@@ -106,7 +106,7 @@ function RegisterForm() {
       }
       // 注册成功，自动登录
       await login({ username: username.trim(), password });
-      router.push("/chat");
+      router.push("/trees");
     } catch (err) {
       setError(err instanceof Error ? err.message : "注册失败");
     } finally {

frontend/src/components/layout/AdminShell.tsx

@@ -184,7 +184,7 @@ export function AdminShell({ children }: { children: ReactNode }) {
 
         {/* 返回主域 — 设计稿 topbar-back */}
         <Link
-          href="/chat"
+          href="/trees"
           className="flex shrink-0 items-center gap-1 rounded-lg px-2 py-1 text-xs font-medium text-muted transition-colors hover:bg-overlay-hover hover:text-fg"
           title="返回主域"
         >