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/i18n/ar.json

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+{
+  "common": {
+    "appName": "SaaS-PDF",
+    "tagline": "أدوات ملفات مجانية على الإنترنت",
+    "upload": "رفع ملف",
+    "download": "تحميل",
+    "processing": "جاري المعالجة...",
+    "dragDrop": "اسحب الملف وأفلته هنا، أو اضغط للاختيار",
+    "maxSize": "الحد الأقصى لحجم الملف: {{size}} ميجابايت",
+    "tryOtherTools": "جرب أدوات أخرى",
+    "error": "خطأ",
+    "success": "تم بنجاح",
+    "loading": "جاري التحميل...",
+    "startOver": "ابدأ من جديد",
+    "home": "الرئيسية",
+    "about": "عن الموقع",
+    "privacy": "سياسة الخصوصية",
+    "terms": "شروط الاستخدام",
+    "language": "اللغة",
+    "allTools": "كل الأدوات"
+  },
+  "home": {
+    "hero": "حوّل ملفاتك فوراً",
+    "heroSub": "أدوات مجانية لمعالجة ملفات PDF والصور والفيديو والنصوص. بدون تسجيل.",
+    "popularTools": "الأدوات الشائعة",
+    "pdfTools": "أدوات PDF",
+    "imageTools": "أدوات الصور",
+    "videoTools": "أدوات الفيديو",
+    "textTools": "أدوات النصوص"
+  },
+  "tools": {
+    "pdfToWord": {
+      "title": "PDF إلى Word",
+      "description": "حوّل ملفات PDF إلى مستندات Word قابلة للتعديل مجاناً.",
+      "shortDesc": "PDF → Word"
+    },
+    "wordToPdf": {
+      "title": "Word إلى PDF",
+      "description": "حوّل مستندات Word (DOC, DOCX) إلى صيغة PDF مجاناً.",
+      "shortDesc": "Word → PDF"
+    },
+    "compressPdf": {
+      "title": "ضغط PDF",
+      "description": "قلّل حجم ملف PDF مع الحفاظ على الجودة. اختر مستوى الضغط.",
+      "shortDesc": "ضغط PDF",
+      "qualityLow": "أقصى ضغط",
+      "qualityMedium": "متوازن",
+      "qualityHigh": "جودة عالية"
+    },
+    "imageConvert": {
+      "title": "محوّل الصور",
+      "description": "حوّل الصور بين صيغ JPG و PNG و WebP فوراً.",
+      "shortDesc": "تحويل الصور"
+    },
+    "videoToGif": {
+      "title": "فيديو إلى GIF",
+      "description": "أنشئ صور GIF متحركة من مقاطع الفيديو. خصّص وقت البداية والمدة والجودة.",
+      "shortDesc": "فيديو → GIF",
+      "startTime": "وقت البداية (ثوانٍ)",
+      "duration": "المدة (ثوانٍ)",
+      "fps": "إطارات في الثانية",
+      "width": "العرض (بكسل)"
+    },
+    "wordCounter": {
+      "title": "عدّاد الكلمات",
+      "description": "عُد الكلمات والحروف والجمل والفقرات في نصك فوراً.",
+      "shortDesc": "عد الكلمات",
+      "words": "كلمات",
+      "characters": "حروف",
+      "sentences": "جمل",
+      "paragraphs": "فقرات",
+      "placeholder": "اكتب أو الصق نصك هنا..."
+    },
+    "textCleaner": {
+      "title": "منظّف النصوص",
+      "description": "أزل المسافات الزائدة، حوّل حالة الحروف، ونظّف نصك فوراً.",
+      "shortDesc": "تنظيف النص",
+      "removeSpaces": "إزالة المسافات الزائدة",
+      "toUpperCase": "أحرف كبيرة",
+      "toLowerCase": "أحرف صغيرة",
+      "toTitleCase": "حروف العنوان",
+      "toSentenceCase": "حالة الجملة",
+      "removeDiacritics": "إزالة التشكيل العربي",
+      "copyResult": "نسخ النتيجة"
+    }
+  },
+  "result": {
+    "conversionComplete": "اكتمل التحويل!",
+    "compressionComplete": "اكتمل الضغط!",
+    "originalSize": "الحجم الأصلي",
+    "newSize": "الحجم الجديد",
+    "reduction": "نسبة التقليل",
+    "downloadReady": "ملفك جاهز للتحميل.",
+    "linkExpiry": "رابط التحميل ينتهي خلال 30 دقيقة."
+  }
+}

frontend/src/i18n/en.json

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+{
+  "common": {
+    "appName": "SaaS-PDF",
+    "tagline": "Free Online File Tools",
+    "upload": "Upload File",
+    "download": "Download",
+    "processing": "Processing...",
+    "dragDrop": "Drag & drop your file here, or click to browse",
+    "maxSize": "Maximum file size: {{size}}MB",
+    "tryOtherTools": "Try Other Tools",
+    "error": "Error",
+    "success": "Success",
+    "loading": "Loading...",
+    "startOver": "Start Over",
+    "home": "Home",
+    "about": "About",
+    "privacy": "Privacy Policy",
+    "terms": "Terms of Service",
+    "language": "Language",
+    "allTools": "All Tools"
+  },
+  "home": {
+    "hero": "Transform Your Files Instantly",
+    "heroSub": "Free online tools for PDF, image, video, and text processing. No registration required.",
+    "popularTools": "Popular Tools",
+    "pdfTools": "PDF Tools",
+    "imageTools": "Image Tools",
+    "videoTools": "Video Tools",
+    "textTools": "Text Tools"
+  },
+  "tools": {
+    "pdfToWord": {
+      "title": "PDF to Word",
+      "description": "Convert PDF files to editable Word documents online for free.",
+      "shortDesc": "PDF → Word"
+    },
+    "wordToPdf": {
+      "title": "Word to PDF",
+      "description": "Convert Word documents (DOC, DOCX) to PDF format online for free.",
+      "shortDesc": "Word → PDF"
+    },
+    "compressPdf": {
+      "title": "Compress PDF",
+      "description": "Reduce PDF file size while maintaining quality. Choose your compression level.",
+      "shortDesc": "Compress PDF",
+      "qualityLow": "Maximum Compression",
+      "qualityMedium": "Balanced",
+      "qualityHigh": "High Quality"
+    },
+    "imageConvert": {
+      "title": "Image Converter",
+      "description": "Convert images between JPG, PNG, and WebP formats instantly.",
+      "shortDesc": "Convert Images"
+    },
+    "videoToGif": {
+      "title": "Video to GIF",
+      "description": "Create animated GIFs from video clips. Customize start time, duration, and quality.",
+      "shortDesc": "Video → GIF",
+      "startTime": "Start Time (seconds)",
+      "duration": "Duration (seconds)",
+      "fps": "Frames Per Second",
+      "width": "Width (pixels)"
+    },
+    "wordCounter": {
+      "title": "Word Counter",
+      "description": "Count words, characters, sentences, and paragraphs in your text instantly.",
+      "shortDesc": "Count Words",
+      "words": "Words",
+      "characters": "Characters",
+      "sentences": "Sentences",
+      "paragraphs": "Paragraphs",
+      "placeholder": "Type or paste your text here..."
+    },
+    "textCleaner": {
+      "title": "Text Cleaner",
+      "description": "Remove extra spaces, convert text case, and clean up your text instantly.",
+      "shortDesc": "Clean Text",
+      "removeSpaces": "Remove Extra Spaces",
+      "toUpperCase": "UPPER CASE",
+      "toLowerCase": "lower case",
+      "toTitleCase": "Title Case",
+      "toSentenceCase": "Sentence case",
+      "removeDiacritics": "Remove Arabic Diacritics",
+      "copyResult": "Copy Result"
+    }
+  },
+  "result": {
+    "conversionComplete": "Conversion Complete!",
+    "compressionComplete": "Compression Complete!",
+    "originalSize": "Original Size",
+    "newSize": "New Size",
+    "reduction": "Reduction",
+    "downloadReady": "Your file is ready for download.",
+    "linkExpiry": "Download link expires in 30 minutes."
+  }
+}

frontend/src/i18n/index.ts

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+import i18n from 'i18next';
+import { initReactI18next } from 'react-i18next';
+import LanguageDetector from 'i18next-browser-languagedetector';
+
+import en from './en.json';
+import ar from './ar.json';
+
+i18n
+  .use(LanguageDetector)
+  .use(initReactI18next)
+  .init({
+    resources: {
+      en: { translation: en },
+      ar: { translation: ar },
+    },
+    fallbackLng: 'en',
+    supportedLngs: ['en', 'ar'],
+    interpolation: {
+      escapeValue: false,
+    },
+    detection: {
+      order: ['querystring', 'cookie', 'localStorage', 'navigator'],
+      caches: ['localStorage', 'cookie'],
+    },
+  });
+
+export default i18n;