feat(login): enhance routing by preserving 'from' path in login redirects

apps/web/app/login/page.tsx

@@ -10,6 +10,7 @@ function LoginForm() {
   const router = useRouter();
   const searchParams = useSearchParams();
   const justSetup = searchParams.get("setup") === "1";
+  const fromPath = searchParams.get("from");
   const [username, setUsername] = useState("");
   const [password, setPassword] = useState("");
   const [error, setError] = useState("");
@@ -29,7 +30,7 @@ function LoginForm() {
       if (res.error) {
         setError(res.error.message ?? "登录失败，请检查用户名和密码");
       } else {
-        router.push("/dashboard");
+        router.push(fromPath ?? "/dashboard");
         router.refresh();
       }
     } catch {
@@ -47,7 +48,7 @@ function LoginForm() {
       if (res?.error) {
         setError(res.error.message ?? "Passkey 登录失败");
       } else {
-        router.push("/dashboard");
+        router.push(fromPath ?? "/dashboard");
         router.refresh();
       }
     } catch {