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/config/env.ts

@@ -0,0 +1,20 @@
+import { z } from 'zod';
+
+const envSchema = z.object({
+  PORT: z.string().optional(),
+  NODE_ENV: z.enum(['development', 'production', 'test']).default('development'),
+  CLOUDFLARE_BUCKET_DOMAIN: z.string().optional(),
+  CLOUDFLARE_ACCESS_KEY: z.string().optional(),
+  CLOUDFLARE_SECRET_ACCESS_KEY: z.string().optional(),
+  CLOUDFLARE_ACCOUNT_ID: z.string().optional(),
+  PUBLIC_SUPABASE_URL: z.string(),
+  PUBLIC_SUPABASE_ANON_KEY: z.string(),
+  ZOHO_TOKEN: z.string().optional(),
+  SMTP_HOST: z.string().optional(),
+  SMTP_PORT: z.string().optional(),
+  SMTP_USER: z.string().optional(),
+  SMTP_PASSWORD: z.string().optional(),
+  SMTP_SENDER: z.string().optional()
+});
+
+export const env = envSchema.parse(process.env);