lucaszub/SkySaver

AI Summary: Implement a mock data mode for the SkySaver application. This involves adding an option (environment variable or parameter) to enable mock mode, modifying the /api/costs endpoint to return mock cost data when mock mode is active, and updating the documentation to explain how to use this feature.

AI Summary: Create a REST API endpoint, `/api/costs`, that retrieves and returns Azure cost data for an authenticated user. The endpoint should accept parameters such as `subscriptionId` and a date range, and implement proper error handling and HTTP status codes. This is part of the SkySaver project, an open-source Azure cost optimization tool.

AI Summary: Implement a backend function to retrieve Azure cost data using the Azure Cost Management API. The function must handle authentication, API errors, and permission issues, and return cost data including date, resource type, usage, unit price, and total cost.

AI Summary: Implement Azure authentication in the SkySaver project, allowing users to connect their Azure accounts using environment variables (AZURE_CLIENT_ID, AZURE_TENANT_ID, AZURE_CLIENT_SECRET) for authentication. This includes clear documentation on obtaining these credentials via Azure AD App Registration.