feat(infra): configure edge function deployment and monitoring (#276)

[Danielodingz]

Closes #276

Edge Function Deployment Configuration (#276)

Overview

This PR configures the edge function deployment pipeline and monitoring for the TeachLink API. All relevant API routes have been migrated to the Edge Runtime to ensure global delivery with minimal latency.

Changes

🛠 Infrastructure

• Created infra/edge-config.ts: Centralized management for:
  • Edge-specific environment variables.
  • CDN caching strategies (public/private).
  • Cold-start optimization settings.
  • Lightweight edge logging utility.
• Updated .env.example: Added new environment variables for edge deployment configuration.

⚡️ API Route Optimizations

• Edge Runtime Migration: Opted 16 API routes into the Edge Runtime (export const runtime = 'edge').
• CDN Caching: Applied Cache-Control strategies to public GET endpoints (Courses) to maximize performance.
• Enhanced Logging: Integrated edgeLog into handlers to ensure visibility in Vercel/Cloudflare log drains.

🔍 Monitoring & Health

• New Health Endpoint: Created /api/health as a lightweight ping target for platform health checkers and keep-alive optimization to reduce cold starts.

Impacted Areas

• src/app/api/courses/*
• src/app/api/auth/*
• src/app/api/admin/feature-flags/*
• src/app/api/lessons/*
• src/app/api/performance/*
• src/app/api/user/*
• src/app/api/video-analytics/*
• src/app/api/notes/*

Acceptance Criteria Verified

• Edge functions configured with proper env vars.
• CDN caching strategy implemented.
• Edge

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[Danielodingz]

Hello @RUKAYAT-CODER please check PR and merge, Thanks.