landing page added

src/shared/request/apiRequest.ts

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+import axios, { AxiosRequestConfig, AxiosResponse } from 'axios';
+
+import { getRouteLang } from './getLanguage';
+
+const baseUrl = process.env.NEXT_PUBLIC_API_BASE_URL;
+
+const api = axios.create({
+  baseURL: baseUrl,
+});
+
+export const apiRequest = async <T>(
+  method: 'GET' | 'POST' | 'PUT' | 'DELETE',
+  url: string,
+  data?: unknown,
+  config?: Omit<AxiosRequestConfig, 'method' | 'url' | 'data'>,
+): Promise<T> => {
+  const response: AxiosResponse<T> = await api.request<T>({
+    method,
+    url,
+    data,
+    ...config,
+    headers: {
+      'Accept-Language': getRouteLang(), // evaluated per-request
+      ...config?.headers,
+    },
+  });
+
+  return response.data;
+};

src/shared/request/getLanguage.ts

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+const defaultLocale = 'uz';
+const locales = ['uz', 'ru', 'en'] as const;
+
+export function getRouteLang(): string {
+  if (typeof window === 'undefined') return defaultLocale;
+
+  // 1)Fall back to the first non-empty pathname segment
+  const rawSegments = window.location.pathname.split('/'); // e.g. ['', 'uz', 'path', ...]
+  const segments = rawSegments.filter(Boolean); // removes empty strings
+  if (segments.length > 0) {
+    const candidate = segments[0]; // first segment after root
+    if (locales.includes(candidate as (typeof locales)[number]))
+      return candidate;
+  }
+
+  // 2) Try cookie NEXT_LOCALE first (language switcher sets it)
+  const cookieMatch = document.cookie
+    .split(';')
+    .map((c) => c.trim())
+    .find((c) => c.startsWith('NEXT_LOCALE='));
+
+  if (cookieMatch) {
+    const cookieLang = cookieMatch.split('=')[1];
+    if (locales.includes(cookieLang as (typeof locales)[number]))
+      return cookieLang;
+  }
+
+  // 3) final fallback
+  return defaultLocale;
+}

src/shared/request/links.ts

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+export const links = {
+  login: '/users/login/',
+  register: '/users/register/',
+};

src/shared/request/plagiarismapi.ts

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+// ─── Constants ───────────────────────────────────────────────────────────────
+
+import {
+  PlagiarismSubmissionPayload,
+  PlagiarismSubmissionResponse,
+} from '@/widgets/fileUpload/lib/types';
+
+const API_BASE_URL = process.env.VITE_API_BASE_URL ?? '/api';
+const ENDPOINT = `${API_BASE_URL}/plagiarism/submit`;
+
+// ─── API Function ────────────────────────────────────────────────────────────
+
+/**
+ * Submits a document for plagiarism checking.
+ * Sends a multipart/form-data request to the backend API.
+ */
+export async function submitPlagiarismCheck(
+  payload: PlagiarismSubmissionPayload,
+): Promise<PlagiarismSubmissionResponse> {
+  const formData = new FormData();
+  formData.append('topic', payload.topic);
+  formData.append('senderFullName', payload.senderFullName);
+  formData.append('file', payload.file);
+  formData.append('withCertificate', String(payload.withCertificate));
+
+  const response = await fetch(ENDPOINT, {
+    method: 'POST',
+    body: formData,
+    // Do NOT set Content-Type manually — the browser sets it with the boundary
+  });
+
+  if (!response.ok) {
+    const errorBody = await response.json().catch(() => ({}));
+    throw new Error(
+      (errorBody as { message?: string }).message ??
+        `Request failed with status ${response.status}`,
+    );
+  }
+
+  return response.json() as Promise<PlagiarismSubmissionResponse>;
+}