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/config/__init__.py

@@ -0,0 +1,93 @@
+import os
+from dotenv import load_dotenv
+
+load_dotenv()
+
+
+class BaseConfig:
+    """Base configuration."""
+    SECRET_KEY = os.getenv("SECRET_KEY", "change-me-in-production")
+
+    # File upload settings
+    MAX_CONTENT_LENGTH = int(os.getenv("MAX_CONTENT_LENGTH_MB", 50)) * 1024 * 1024
+    UPLOAD_FOLDER = os.getenv("UPLOAD_FOLDER", "/tmp/uploads")
+    OUTPUT_FOLDER = os.getenv("OUTPUT_FOLDER", "/tmp/outputs")
+    FILE_EXPIRY_SECONDS = int(os.getenv("FILE_EXPIRY_SECONDS", 1800))
+
+    # Allowed file extensions and MIME types
+    ALLOWED_EXTENSIONS = {
+        "pdf": ["application/pdf"],
+        "doc": ["application/msword"],
+        "docx": [
+            "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
+        ],
+        "png": ["image/png"],
+        "jpg": ["image/jpeg"],
+        "jpeg": ["image/jpeg"],
+        "webp": ["image/webp"],
+        "mp4": ["video/mp4"],
+        "webm": ["video/webm"],
+    }
+
+    # File size limits per type (bytes)
+    FILE_SIZE_LIMITS = {
+        "pdf": 20 * 1024 * 1024,      # 20MB
+        "doc": 15 * 1024 * 1024,       # 15MB
+        "docx": 15 * 1024 * 1024,      # 15MB
+        "png": 10 * 1024 * 1024,       # 10MB
+        "jpg": 10 * 1024 * 1024,       # 10MB
+        "jpeg": 10 * 1024 * 1024,      # 10MB
+        "webp": 10 * 1024 * 1024,      # 10MB
+        "mp4": 50 * 1024 * 1024,       # 50MB
+        "webm": 50 * 1024 * 1024,      # 50MB
+    }
+
+    # Redis
+    REDIS_URL = os.getenv("REDIS_URL", "redis://redis:6379/0")
+
+    # Celery
+    CELERY_BROKER_URL = os.getenv("CELERY_BROKER_URL", "redis://redis:6379/0")
+    CELERY_RESULT_BACKEND = os.getenv("CELERY_RESULT_BACKEND", "redis://redis:6379/1")
+
+    # AWS S3
+    AWS_ACCESS_KEY_ID = os.getenv("AWS_ACCESS_KEY_ID")
+    AWS_SECRET_ACCESS_KEY = os.getenv("AWS_SECRET_ACCESS_KEY")
+    AWS_S3_BUCKET = os.getenv("AWS_S3_BUCKET", "saas-pdf-temp-files")
+    AWS_S3_REGION = os.getenv("AWS_S3_REGION", "eu-west-1")
+
+    # CORS
+    CORS_ORIGINS = os.getenv("CORS_ORIGINS", "http://localhost:5173").split(",")
+
+    # Rate Limiting
+    RATELIMIT_STORAGE_URI = os.getenv("REDIS_URL", "redis://redis:6379/0")
+    RATELIMIT_DEFAULT = "100/hour"
+
+
+class DevelopmentConfig(BaseConfig):
+    """Development configuration."""
+    DEBUG = True
+    TESTING = False
+
+
+class ProductionConfig(BaseConfig):
+    """Production configuration."""
+    DEBUG = False
+    TESTING = False
+    # Stricter rate limits in production
+    RATELIMIT_DEFAULT = "60/hour"
+
+
+class TestingConfig(BaseConfig):
+    """Testing configuration."""
+    DEBUG = True
+    TESTING = True
+    UPLOAD_FOLDER = "/tmp/test_uploads"
+    OUTPUT_FOLDER = "/tmp/test_outputs"
+
+
+config = {
+    "development": DevelopmentConfig,
+    "production": ProductionConfig,
+    "testing": TestingConfig,
+    "default": DevelopmentConfig,
+}