Implement Finances, Club Management, and League Structure

[tunotemetas]

Design and implement the finances system, core club management logic, and a multi-tier league system suitable for offline and time-skippable football manager gameplay.

Features:

• Club finances, including income sources (tickets, merchandise, transfers) and expenses (wages, staff, stadium upgrades, sponsorships)
• Financial UI components and summary reports
• Multi-division league system populated with AI clubs, supporting promotion/relegation and automated season scheduling
• Handling of stadium upgrades, staff management, and sponsorship negotiations
• Save/load and persist full league and club states
• Regeneration of league fixtures and seasons on time skip

Subtasks:

• Design and implement data models for clubs, finances, and leagues
• Finance engine for all relevant sources and uses of funds
• League and group scheduling logic
• Management dashboard UI for reporting and quick actions
• API and logic for instant time skip/simulation

This will provide the backbone for management and simulation within the football manager game.