Add OCR, Background Removal, and PDF Editor features with tests

- Implemented OCR functionality using pytesseract for image and PDF text extraction.
- Added Background Removal service using rembg for image processing.
- Developed PDF Editor service for applying text annotations to PDF files.
- Created corresponding API routes for OCR, Background Removal, and PDF Editor.
- Added frontend components for OCR and Background Removal tools.
- Integrated feature flagging for new tools, ensuring they are disabled by default.
- Implemented comprehensive unit tests for OCR service, PDF editor, and background removal.
- Updated documentation to reflect new features and usage instructions.
- Added translations for new features in English, Arabic, and French.

frontend/src/i18n/ar.json

@@ -110,6 +110,25 @@
       "lockAspect": "قفل نسبة العرض للارتفاع",
       "aspectHint": "أدخل بُعداً واحداً — سيتم حساب الآخر تلقائياً للحفاظ على نسبة العرض للارتفاع."
     },
+    "ocr": {
+      "title": "OCR — التعرف على النصوص",
+      "description": "استخرج النصوص من الصور ومستندات PDF الممسوحة ضوئياً باستخدام التعرف الضوئي على الحروف.",
+      "shortDesc": "استخراج نص",
+      "sourceType": "نوع المصدر",
+      "modeImage": "صورة",
+      "modePdf": "PDF",
+      "language": "لغة التعرف",
+      "extract": "استخراج النص",
+      "charsExtracted": "تم استخراج {{count}} حرف",
+      "copyText": "نسخ النص"
+    },
+    "removeBg": {
+      "title": "إزالة الخلفية",
+      "description": "أزل خلفية الصور تلقائياً بالذكاء الاصطناعي. احصل على صورة PNG شفافة في ثوانٍ.",
+      "shortDesc": "إزالة الخلفية",
+      "remove": "إزالة الخلفية",
+      "success": "تمت إزالة الخلفية بنجاح!"
+    },
     "videoToGif": {
       "title": "فيديو إلى GIF",
       "description": "أنشئ صور GIF متحركة من مقاطع الفيديو. خصّص وقت البداية والمدة والجودة.",

frontend/src/i18n/en.json

@@ -110,6 +110,25 @@
       "lockAspect": "Lock aspect ratio",
       "aspectHint": "Enter one dimension — the other will auto-calculate to preserve aspect ratio."
     },
+    "ocr": {
+      "title": "OCR — Text Recognition",
+      "description": "Extract text from images and scanned PDF documents using optical character recognition.",
+      "shortDesc": "Extract Text",
+      "sourceType": "Source Type",
+      "modeImage": "Image",
+      "modePdf": "PDF",
+      "language": "OCR Language",
+      "extract": "Extract Text",
+      "charsExtracted": "{{count}} characters extracted",
+      "copyText": "Copy Text"
+    },
+    "removeBg": {
+      "title": "Remove Background",
+      "description": "Remove the background from images automatically using AI. Get a transparent PNG in seconds.",
+      "shortDesc": "Remove BG",
+      "remove": "Remove Background",
+      "success": "Background removed successfully!"
+    },
     "videoToGif": {
       "title": "Video to GIF",
       "description": "Create animated GIFs from video clips. Customize start time, duration, and quality.",

frontend/src/i18n/fr.json

@@ -110,6 +110,25 @@
       "lockAspect": "Verrouiller le rapport d'aspect",
       "aspectHint": "Entrez une dimension — l'autre sera calculée automatiquement pour préserver le rapport d'aspect."
     },
+    "ocr": {
+      "title": "OCR — Reconnaissance de texte",
+      "description": "Extrayez le texte des images et des documents PDF numérisés grâce à la reconnaissance optique de caractères.",
+      "shortDesc": "Extraire le texte",
+      "sourceType": "Type de source",
+      "modeImage": "Image",
+      "modePdf": "PDF",
+      "language": "Langue OCR",
+      "extract": "Extraire le texte",
+      "charsExtracted": "{{count}} caractères extraits",
+      "copyText": "Copier le texte"
+    },
+    "removeBg": {
+      "title": "Supprimer l'arrière-plan",
+      "description": "Supprimez l'arrière-plan des images automatiquement grâce à l'IA. Obtenez un PNG transparent en quelques secondes.",
+      "shortDesc": "Suppr. arrière-plan",
+      "remove": "Supprimer l'arrière-plan",
+      "success": "Arrière-plan supprimé avec succès !"
+    },
     "videoToGif": {
       "title": "Vidéo en GIF",
       "description": "Créez des GIFs animés à partir de clips vidéo. Personnalisez le temps de début, la durée et la qualité.",