feat: add routes-f rewards endpoints

[Obiajulu-gif]

This pull request implements a comprehensive rewards system for users, including database schema, business logic, and API endpoints for rewards balance, redemption, and history. It also adds robust test coverage for these endpoints. The most important changes are grouped below by theme.

Rewards System Core Logic and Database:

• Introduced a new rewards system in db.ts with reward tiers, definitions, and catalog, as well as logic for syncing reward events (watching, chatting, tipping), calculating balances, and handling atomic transactions for redemption. Includes schema creation and helper utilities.

API Endpoints:

• Added GET /api/routes-f/rewards endpoint to return the authenticated user's current reward points, lifetime points, and tier, ensuring schema and synchronization before responding.
• Implemented POST /api/routes-f/rewards/redeem endpoint to allow users to redeem rewards atomically, with validation, transactional safety, and detailed response/error handling.
• Added GET /api/routes-f/rewards/history endpoint to return paginated reward event history for the user, with support for cursor-based pagination and error handling.

Test Coverage:

• Added unit tests for the rewards balance endpoint, covering both authenticated and unauthenticated access, and verifying correct synchronization and response structure.
• Added unit tests for the rewards redemption endpoint, covering successful redemption, insufficient points, and missing rewards.
• Added unit tests for the rewards history endpoint, verifying correct ordering, pagination, and error handling for invalid parameters.

Closes #455

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[Obiajulu-gif]

@Depo-dev @claude please merge my code