chore: move backend to hono + typescript (#558)

* feat: setup secure presigned uploads and downloads

* clean up

* update lock

* Get presigned url finally working

* 557: Migrate backend to hono + ts

* chore: update Dockerfile and package.json for backend configuration

* add dev command

* remove unused packages

* Enhance backend API and frontend components for course management

- Updated CORS configuration in the backend to allow specific methods and headers.
- Refactored lesson download endpoint to use a new route for PDF downloads.
- Removed unused certificate download functionality from the lesson router.
- Updated frontend components to reflect changes in API endpoints and improve video upload functionality.
- Introduced new video upload component and adjusted video handling in lesson materials.
- Cleaned up unnecessary imports and optimized component structure for better performance.

* PR cleanups

* Enhance email configuration by adding SMTP_SENDER environment variable

- Updated docker-compose.yaml to include SMTP_SENDER.
- Modified Dockerfile to accept SMTP_SENDER as an argument.
- Updated environment schema in env.ts to define SMTP_SENDER as optional.
- Adjusted mail service to use SMTP_SENDER for the email 'from' field.
- Updated documentation to reflect the new SMTP_SENDER variable.

* Remove debug log statement from sendEmail function

---------

Co-authored-by: Iniubong Obonguko <iniubongobonguko2018@gmail.com>

apps/backend/src/constants/index.ts

@@ -0,0 +1,25 @@
+import { env } from '$src/config/env';
+
+const {
+  CLOUDFLARE_BUCKET_DOMAIN,
+  CLOUDFLARE_ACCESS_KEY,
+  CLOUDFLARE_SECRET_ACCESS_KEY,
+  CLOUDFLARE_ACCOUNT_ID
+} = env;
+
+export const CLOUDFLARE = {
+  CONFIGS: {
+    BUCKET_DOMAIN: CLOUDFLARE_BUCKET_DOMAIN!,
+    ACCESS_KEY: CLOUDFLARE_ACCESS_KEY!,
+    SECRET_ACCESS_KEY: CLOUDFLARE_SECRET_ACCESS_KEY!,
+    ACCOUNT_ID: CLOUDFLARE_ACCOUNT_ID!
+  },
+  R2: {
+    BUCKET: 'videos',
+    BUCKET_DOMAIN: CLOUDFLARE_ACCOUNT_ID
+      ? `https://${CLOUDFLARE_ACCOUNT_ID}.r2.cloudflarestorage.com`
+      : CLOUDFLARE_BUCKET_DOMAIN!,
+    PRESIGN_EXPIRATION_TIME: 60 * 60, // 1 hour
+    DOWNLOAD_EXPIRATION_TIME: 60 * 60 * 3 // 3 hours
+  }
+} as const;