Implemented Retrieval & Statistics Endpoints

[Mkalbani]

This closes #171

Summary of Implementation

• 3 Read-only Endpoints Created:

• GET /progress - Paginated answer history ordered by attemptedAt DESC

• GET /progress/stats - Overall stats (total attempts, correct, accuracy %, points, time spent)

• GET /progress/category/:id - Category stats (attempts, correct answers, accuracy %)

Key Implementation Details:

• Efficient QueryBuilder - All queries use TypeORM QueryBuilder with proper aggregations
• Leveraged Indexes - Queries use indexed columns: [userId, attemptedAt], [userId, puzzleId], [categoryId]
• Pagination Support - Uses existing pagination helper with configurable limit/page
• Auth Protected - JWT authentication via @UseGuards(AuthGuard('jwt'))
• DTOs Created:
• ProgressHistoryDto
• CategoryStatsDto
• OverallStatsDto
• PaginatedProgressDto

[phertyameen]

You have a dependency error. Please look into it.

[Mkalbani]

@phertyameen done!!

[phertyameen]

Awsome. Do apply for more issues in the future. Smiles!