Add Season Pass System

[MohamedAliAwad]

Add a new 'Season Pass' feature to the game.

Goal: Implement a season pass system to reward player engagement with exclusive seasonal content.

Requirements:

• Season pass duration should be configurable (e.g., 8 weeks per season).
• Both free and premium reward tracks, with the premium track available for in-game currency purchase.
• Players earn experience toward unlocking rewards by completing quests, defeating monsters, or participating in events.
• Seasonal rewards include gold, items, cosmetics, and exclusive titles.
• Progression and claimable rewards must persist in the database (suggest DB schema update or new tables for tracking progress per account).
• UI: Add a season pass menu, progress bar, and notifications for new or claimable rewards.
• Admin tools to configure rewards, season dates, and pricing.
• Optionally consider payment integration or premium purchase using in-game currency.

Acceptance Criteria:

• Season pass activates for all players when the season starts.
• Progression and rewards are clearly tracked per player.
• UI allows users to view, track, and claim rewards.
• Admins can fully configure season details and rewards.
• Feature is robust and secure against abuse/exploit.

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This is a major core system request and may require new server logic, UI additions, database schema changes, and a configuration interface.