feat: complete tree shell cutover and regression coverage

wolai-frontend/src/app/api/auth/mnote-web-token/route.ts

@@ -0,0 +1,35 @@
+import { NextResponse } from "next/server";
+import { convexAuthNextjsToken } from "@convex-dev/auth/nextjs/server";
+
+const COOKIE_NAME = "mnote_web_convex_token";
+
+export const dynamic = "force-dynamic";
+
+export async function GET() {
+  const token = (await convexAuthNextjsToken())?.trim() ?? "";
+
+  if (!token) {
+    const response = NextResponse.json({ error: "未登录" }, { status: 401 });
+    response.cookies.set({
+      name: COOKIE_NAME,
+      value: "",
+      httpOnly: true,
+      sameSite: "lax",
+      path: "/",
+      maxAge: 0,
+    });
+    response.headers.set("cache-control", "no-store");
+    return response;
+  }
+
+  const response = NextResponse.json({ ok: true });
+  response.cookies.set({
+    name: COOKIE_NAME,
+    value: token,
+    httpOnly: true,
+    sameSite: "lax",
+    path: "/",
+  });
+  response.headers.set("cache-control", "no-store");
+  return response;
+}