main
feat: comprehensive admin panel improvements — auth consolidation, error handling, i18n, audit logging, UX
fix: standardize API error responses with success field in 22 routes
chore: add Prettier formatter, format entire codebase, integrate with ESLint and lint-staged
Add advanced analytics modules: academic timeline, student comparison, skill gap matrix, study patterns, at-risk students, platform health, executive summary, registration funnel, content performance, attempt efficiency, aggregate performance, analytics cache, and i18n/auth/export utilities
refactor: consolidate user route auth, add leaderboard auth, fix sanitization bug
refactor: replace manual request.json() + validateBody with parseAndValidate in 22 API routes
modified: eslint.config.mjs modified: next.config.ts new file: src/__tests__/admin-api.test.ts modified: src/__tests__/api-routes-integration.test.ts modified: src/__tests__/db-admin.test.ts new file: src/__tests__/dump-adapted.tmp.test.ts new file: src/__tests__/dump-tasks.tmp.test.ts new file: src/__tests__/dump-tasks2.tmp.test.ts modified: src/__tests__/export-utils.test.ts modified: src/__tests__/student-dashboard.test.tsx new file: src/__tests__/task-content-audit.test.ts modified: src/__tests__/teacher-api.test.ts modified: src/app/(main)/app/page.tsx modified: src/app/api/admin/analytics/student/[id]/academic-summary/route.ts modified: src/app/api/admin/analytics/student/[id]/route.ts modified: src/app/api/admin/analytics/student/[id]/streak/route.ts modified: src/app/api/admin/analytics/student/[id]/timeline/route.ts modified: src/app/api/admin/deadlines/[id]/route.ts modified: src/app/api/admin/users/[id]/ban/route.ts modified: src/app/api/admin/users/[id]/restore/route.ts modified: src/app/api/admin/users/[id]/role/route.ts modified: src/app/api/admin/users/[id]/route.ts modified: src/app/api/admin/users/[id]/unban/route.ts modified: src/app/api/performance/analytics/route.ts modified: src/app/api/performance/route.ts modified: src/app/api/sql-performance/route.ts modified: src/app/api/sql/explain/route.ts modified: src/app/api/sql/route.ts modified: src/app/api/teacher/groups/[id]/deadlines/route.ts modified: src/app/api/teacher/groups/[id]/members/route.ts modified: src/app/api/teacher/groups/[id]/notify/route.ts modified: src/app/api/teacher/groups/[id]/route.ts modified: src/app/api/teacher/groups/route.ts modified: src/app/api/teacher/student/[id]/activity/route.ts modified: src/app/api/teacher/student/[id]/route.ts modified: src/app/api/web-vitals/analytics/route.ts modified: src/components/action-bar.tsx modified: src/components/admin/analytics/achievement-analytics.tsx modified: src/components/admin/analytics/student-academic-profile.tsx modified: src/components/admin/analytics/student-detail-dialog.tsx modified: src/components/admin/analytics/time-to-complete-chart.tsx modified: src/components/admin/extended-performance-dashboard.tsx modified: src/components/admin/performance-dashboard.tsx modified: src/components/admin/system-health.tsx modified: src/components/er-diagram.tsx modified: src/components/landing-page.tsx modified: src/components/locale-selector.tsx modified: src/components/profile/achievements-grid.tsx modified: src/components/query-history.tsx modified: src/components/task-panel.tsx modified: src/components/teacher/teacher-student-dialog.tsx modified: src/components/theme-toggle.tsx modified: src/components/web-vitals.tsx modified: src/hooks/use-keyboard-shortcuts.ts modified: src/lib/api-auth.ts modified: src/lib/auth-internal.ts modified: src/lib/auth.ts modified: src/lib/db-monitor.ts modified: src/lib/db/analytics.ts deleted: src/lib/db/analytics/activity.ts deleted: src/lib/db/analytics/core.ts new file: src/lib/db/analytics/deadlines.ts new file: src/lib/db/analytics/groups.ts deleted: src/lib/db/analytics/index.ts new file: src/lib/db/analytics/notifications.ts new file: src/lib/db/analytics/reminders.ts deleted: src/lib/db/analytics/student-analytics.ts modified: src/lib/db/progress.ts modified: src/lib/db/recommendations.ts modified: src/lib/db/users.ts modified: src/lib/email.ts modified: src/lib/export-utils.ts modified: src/lib/i18n.ts modified: src/lib/logger.ts modified: src/lib/mongodb-engine.ts modified: src/lib/performance-export.ts modified: src/lib/performance-monitor.ts new file: src/lib/performance-types.ts modified: src/lib/postgresql-adapter.ts modified: src/lib/rate-limit.ts modified: src/lib/sql-engine.ts modified: src/lib/store/gamification-slice.ts modified: src/lib/store/practice-mode-slice.ts modified: src/lib/use-polling.ts modified: src/locales/en.json modified: src/locales/ru.json modified: src/locales/zh.json modified: todo.md modified: tsconfig.json