feat: add expo module

[lcaohoanq]

Summary by CodeRabbit

• New Features
  • Launched the BIT Learning mobile app with secure sign-in (email/password and Google OAuth).
  • Added tabs for home, course search, learning progress, and profile (view/edit/logout).
  • Added course details, lesson playback (video), quizzes, lesson completion, certificates, and sharing/saving PDFs.
  • Enabled deep links to open courses directly in the app and redirected unauthenticated/authenticated users appropriately.
• Documentation
  • Added initial mobile app setup docs, environment variable configuration guidance, and backend redirect/app-link requirements.

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📝 Walkthrough

Walkthrough

Adds a new Expo mobile learner app with environment and build configuration, authentication, typed API access, protected navigation, course discovery, enrollment, lessons, certificates, profile management, and Android native configuration.

Changes

Mobile learner application

Layer / File(s)	Summary
Expo foundation and shared UI apps/mobile/.env.example, apps/mobile/README.md, apps/mobile/app.json, apps/mobile/eas.json, apps/mobile/package.json, apps/mobile/tsconfig.json, apps/mobile/lib/types.ts, apps/mobile/components/ui.tsx	Adds Expo and EAS configuration, environment guidance, TypeScript settings, API/domain types, and reusable mobile UI components.
API and authentication flow apps/mobile/lib/api.ts, apps/mobile/lib/learner.ts, apps/mobile/lib/session.ts, apps/mobile/providers/auth.tsx, apps/mobile/app/(auth)/*, apps/mobile/app/_layout.tsx, apps/mobile/app/index.tsx	Adds typed API requests with token refresh, secure session persistence, protected routing, email/password and Google authentication, registration, and root navigation setup.
Navigation and course browsing apps/mobile/app/(tabs)/*, apps/mobile/app/course/[id].tsx, apps/mobile/app/open-mobile.tsx, apps/mobile/components/course-card.tsx	Adds tab navigation, home, course search, learning filters, profile display, course cards, enrollment, access-controlled lecture links, and deep-link routing.
Lessons, certificates, and profile editing apps/mobile/app/lesson/[courseId]/[lectureId].tsx, apps/mobile/app/certificate/[courseId].tsx, apps/mobile/app/profile/edit.tsx, apps/mobile/lib/last-lecture.ts	Adds video, quiz, and text lessons with progress synchronization, last-lecture persistence, certificate download/sharing, and profile updates.
Android native build and runtime configuration apps/mobile/android/*	Adds Gradle and wrapper configuration, React Native application bootstrapping, manifests, native resources, launcher assets, ProGuard rules, and Expo autolinking setup.

Estimated code review effort: 4 (Complex) | ~75 minutes

Sequence Diagram(s)

sequenceDiagram
  participant Learner
  participant MobileApp
  participant AuthProvider
  participant SecureStore
  participant API
  Learner->>MobileApp: Open app
  MobileApp->>AuthProvider: Initialize authentication
  AuthProvider->>SecureStore: Load session
  MobileApp->>API: Fetch courses or lesson data
  API-->>MobileApp: Return learner data
  MobileApp-->>Learner: Render protected learner screen

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[github-actions]

✅ Frontend build passed

All build checks for this pull request have completed successfully.

This PR is now green from CI and can be merged once required reviews are approved.

🔀 Branch	feature/add-expo-module
📝 Commit	8893a0ab7c9c53f3aa4c9ebf17239a782fba2a2d
🕐 Run	#426

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❌ Deploy Preview for bit-learning failed.

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[github-actions]

✅ Frontend build passed

All build checks for this pull request have completed successfully.

This PR is now green from CI and can be merged once required reviews are approved.

🔀 Branch	feature/add-expo-module
📝 Commit	c1123f1c5819c1a48dee136248e628482d44d3eb
🕐 Run	#489