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Introduces retirement and FIRE (Financial Independence, Retire Early) planning as a new top-level feature in the sidebar navigation. Key features: - RetirementConfig model: stores retirement planning parameters per family (birth year, retirement age, target income, pension system, etc.) - PensionEntry model: tracks pension statements (Renteninformation) over time with pension points, current/projected monthly pension - German GRV pension calculations: - Estimated monthly pension from Entgeltpunkte x Rentenwert - After-tax pension estimation - Monthly pension gap analysis - FIRE calculations: - FIRE number (capital needed via 4% rule, inflation-adjusted) - FIRE progress percentage from current portfolio value - Estimated FIRE date (iterative monthly projection) - Required monthly savings to close pension gap - Dashboard view with overview cards, FIRE progress bar, assumptions panel, and pension history table with add/delete entries - Setup and edit views for configuring retirement parameters - Full i18n support (English + German) - Minitest coverage for models and controller Database: 2 new tables (retirement_configs, pension_entries) with UUID PKs Routes: singular resource with setup, add/destroy pension entry actions This is an initial implementation focused on the German GRV pension system. The architecture supports extending to other pension systems (custom/other). Open to suggestions and improvements from the community - contributions for additional pension systems, visualization charts, or calculation refinements are very welcome.