feat: add admin analytics dashboard with deep metrics, charts, and filtering - #16
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…s and charts Provides a full-stack e-learning admin dashboard, featuring deep analytics metrics with time and exam type filters. Implements a Node.js/Express/TypeScript backend with efficient in-memory filtering and caching, and a React/TypeScript frontend visualizing metrics using Chart.js. Filters and chart interactivity enhance admin data analysis capabilities. - Calculates total learners, attempts, pass ratio, scores (avg/median/SD/min/max), and aggregates proficiency levels - Adds cached and optimized REST endpoint for metric queries - Frontend includes responsive filter controls, metric cards, bar and doughnut charts - Improves user experience and observability for admin role
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Summary
This PR introduces a full admin dashboard for analytics in the e-Learning platform. It provides deep metrics, optimized filtering, time range/exam type filters, and data caching, with visualizations via Chart.js in the React frontend.
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