feat: Initialize frontend with React, Vite, and Tailwind CSS

- Set up main entry point for React application.
- Create About, Home, NotFound, Privacy, and Terms pages with SEO support.
- Implement API service for file uploads and task management.
- Add global styles using Tailwind CSS.
- Create utility functions for SEO and text processing.
- Configure Vite for development and production builds.
- Set up Nginx configuration for serving frontend and backend.
- Add scripts for cleanup of expired files and sitemap generation.
- Implement deployment script for production environment.

frontend/src/pages/PrivacyPage.tsx

@@ -0,0 +1,59 @@
+import { useTranslation } from 'react-i18next';
+import { Helmet } from 'react-helmet-async';
+
+export default function PrivacyPage() {
+  const { t } = useTranslation();
+
+  return (
+    <>
+      <Helmet>
+        <title>{t('common.privacy')} — {t('common.appName')}</title>
+        <meta name="description" content="Privacy policy for our online tools." />
+      </Helmet>
+
+      <div className="prose mx-auto max-w-2xl dark:prose-invert">
+        <h1>{t('common.privacy')}</h1>
+        <p><em>Last updated: {new Date().toISOString().split('T')[0]}</em></p>
+
+        <h2>1. Data Collection</h2>
+        <p>
+          We only collect files you intentionally upload for processing. We do not
+          require registration, and we do not store personal information.
+        </p>
+
+        <h2>2. File Processing & Storage</h2>
+        <ul>
+          <li>Uploaded files are processed on our secure servers.</li>
+          <li>All uploaded and output files are <strong>automatically deleted within 2 hours</strong>.</li>
+          <li>Files are stored in encrypted cloud storage during processing.</li>
+          <li>We do not access, read, or share the content of your files.</li>
+        </ul>
+
+        <h2>3. Cookies & Analytics</h2>
+        <p>
+          We use essential cookies to remember your language preference. We may use
+          Google Analytics and Google AdSense, which may place their own cookies.
+          You can manage cookie preferences in your browser settings.
+        </p>
+
+        <h2>4. Third-Party Services</h2>
+        <ul>
+          <li><strong>Google AdSense</strong> — for displaying advertisements.</li>
+          <li><strong>AWS S3</strong> — for temporary file storage.</li>
+        </ul>
+
+        <h2>5. Security</h2>
+        <p>
+          We employ industry-standard security measures including HTTPS encryption,
+          file validation, rate limiting, and automatic file cleanup.
+        </p>
+
+        <h2>6. Contact</h2>
+        <p>
+          Questions about this policy? Contact us at{' '}
+          <a href="mailto:support@example.com">support@example.com</a>.
+        </p>
+      </div>
+    </>
+  );
+}