- Create DashboardAnalyticsController with 6 analytics endpoints:
- Net worth calculation and comparison
- Monthly spending with period comparison
- Cash flow (income vs expenses)
- Net worth evolution over time
- Account balance history
- Top spending categories
- Add PeriodComparator service for date range comparisons
- Update DashboardController to pass categories, accounts, and banks
- Add comprehensive feature tests for all analytics endpoints
- Register analytics routes under /api/dashboard
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