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/utils/sanitizer.py

@@ -0,0 +1,77 @@
+"""Filename sanitization and temporary file management."""
+import os
+import uuid
+
+from flask import current_app
+
+
+def generate_safe_path(extension: str, folder_type: str = "upload") -> tuple[str, str]:
+    """
+    Generate a safe file path using UUID.
+
+    Args:
+        extension: File extension (without dot)
+        folder_type: "upload" for input files, "output" for processed files
+
+    Returns:
+        tuple: (task_id, full_file_path)
+    """
+    task_id = str(uuid.uuid4())
+
+    if folder_type == "upload":
+        base_dir = current_app.config["UPLOAD_FOLDER"]
+    else:
+        base_dir = current_app.config["OUTPUT_FOLDER"]
+
+    # Create task-specific directory
+    task_dir = os.path.join(base_dir, task_id)
+    os.makedirs(task_dir, exist_ok=True)
+
+    filename = f"{task_id}.{extension}"
+    file_path = os.path.join(task_dir, filename)
+
+    return task_id, file_path
+
+
+def get_output_path(task_id: str, extension: str) -> str:
+    """
+    Get the output file path for a processed file.
+
+    Args:
+        task_id: The task UUID
+        extension: Output file extension
+
+    Returns:
+        Full output file path
+    """
+    output_dir = current_app.config["OUTPUT_FOLDER"]
+    task_dir = os.path.join(output_dir, task_id)
+    os.makedirs(task_dir, exist_ok=True)
+
+    filename = f"{task_id}.{extension}"
+    return os.path.join(task_dir, filename)
+
+
+def cleanup_task_files(task_id: str, keep_outputs: bool = False):
+    """
+    Remove temporary files for a given task.
+
+    Args:
+        task_id: The task UUID
+        keep_outputs: If True, only clean uploads (used in local storage mode)
+    """
+    import shutil
+
+    upload_dir = current_app.config.get("UPLOAD_FOLDER", "/tmp/uploads")
+    output_dir = current_app.config.get("OUTPUT_FOLDER", "/tmp/outputs")
+
+    # Always clean uploads
+    upload_task_dir = os.path.join(upload_dir, task_id)
+    if os.path.exists(upload_task_dir):
+        shutil.rmtree(upload_task_dir, ignore_errors=True)
+
+    # Only clean outputs when using S3 (files already uploaded to S3)
+    if not keep_outputs:
+        output_task_dir = os.path.join(output_dir, task_id)
+        if os.path.exists(output_task_dir):
+            shutil.rmtree(output_task_dir, ignore_errors=True)