This commit introduces significant updates to the cost management functionality, including:
- New endpoints for retrieving cost summaries and generating expenses from lists, improving user interaction with financial data.
- Implementation of a service layer for cost-related logic, encapsulating the core business rules for calculating cost summaries and managing expenses.
- Introduction of a financial activity endpoint to consolidate user expenses and settlements, enhancing the user experience by providing a comprehensive view of financial activities.
- Refactoring of existing code to improve maintainability and clarity, including the addition of new exception handling for financial conflicts.
These changes aim to streamline cost management processes and enhance the overall functionality of the application.
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