feat(dashboard): add transactions and users management pages with CRUD functionality

feat(auth): implement login page and authentication middleware
feat(sidebar): create sidebar component with user info and navigation links
feat(api): establish API client for interacting with backend services

apps/web/middleware.ts

@@ -0,0 +1,27 @@
+import { NextRequest, NextResponse } from "next/server";
+
+export async function middleware(request: NextRequest) {
+  const { pathname } = request.nextUrl;
+
+  // 只保护 /dashboard 路由
+  if (!pathname.startsWith("/dashboard")) {
+    return NextResponse.next();
+  }
+
+  // 检查 better-auth session cookie（cookie 前缀是 helios_auth）
+  const sessionCookie =
+    request.cookies.get("helios_auth.session_token") ??
+    request.cookies.get("__Secure-helios_auth.session_token");
+
+  if (!sessionCookie) {
+    const loginUrl = new URL("/login", request.url);
+    loginUrl.searchParams.set("from", pathname);
+    return NextResponse.redirect(loginUrl);
+  }
+
+  return NextResponse.next();
+}
+
+export const config = {
+  matcher: ["/dashboard/:path*"],
+};