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.

backend/app/tasks/compress_tasks.py

@@ -0,0 +1,88 @@
+"""Celery tasks for PDF compression."""
+import os
+import logging
+
+from app.extensions import celery
+from app.services.compress_service import compress_pdf, PDFCompressionError
+from app.services.storage_service import storage
+from app.utils.sanitizer import cleanup_task_files
+
+
+def _cleanup(task_id: str):
+    cleanup_task_files(task_id, keep_outputs=not storage.use_s3)
+
+logger = logging.getLogger(__name__)
+
+
+@celery.task(bind=True, name="app.tasks.compress_tasks.compress_pdf_task")
+def compress_pdf_task(
+    self,
+    input_path: str,
+    task_id: str,
+    original_filename: str,
+    quality: str = "medium",
+):
+    """
+    Async task: Compress a PDF file.
+
+    Args:
+        input_path: Path to the uploaded PDF file
+        task_id: Unique task identifier
+        original_filename: Original filename for download
+        quality: Compression quality ("low", "medium", "high")
+
+    Returns:
+        dict with download_url, compression stats, and file info
+    """
+    output_dir = os.path.join("/tmp/outputs", task_id)
+    os.makedirs(output_dir, exist_ok=True)
+    output_path = os.path.join(output_dir, f"{task_id}.pdf")
+
+    try:
+        self.update_state(
+            state="PROCESSING",
+            meta={"step": f"Compressing PDF ({quality} quality)..."},
+        )
+
+        # Compress using Ghostscript
+        stats = compress_pdf(input_path, output_path, quality)
+
+        self.update_state(state="PROCESSING", meta={"step": "Uploading result..."})
+
+        # Upload to S3
+        s3_key = storage.upload_file(output_path, task_id, folder="outputs")
+
+        # Generate download filename
+        name_without_ext = os.path.splitext(original_filename)[0]
+        download_name = f"{name_without_ext}_compressed.pdf"
+
+        download_url = storage.generate_presigned_url(
+            s3_key, original_filename=download_name
+        )
+
+        result = {
+            "status": "completed",
+            "download_url": download_url,
+            "filename": download_name,
+            "original_size": stats["original_size"],
+            "compressed_size": stats["compressed_size"],
+            "reduction_percent": stats["reduction_percent"],
+        }
+
+        _cleanup(task_id)
+
+        logger.info(
+            f"Task {task_id}: PDF compression completed — "
+            f"{stats['reduction_percent']}% reduction"
+        )
+        return result
+
+    except PDFCompressionError as e:
+        logger.error(f"Task {task_id}: Compression error — {e}")
+        _cleanup(task_id)
+        return {"status": "failed", "error": str(e)}
+
+    except Exception as e:
+        logger.error(f"Task {task_id}: Unexpected error — {e}")
+        _cleanup(task_id)
+        return {"status": "failed", "error": "An unexpected error occurred."}