feat: restructure backend with Elysia framework and add MQTT adapter

- Updated .gitignore to exclude generated files and database
- Modified package.json to change dev script and add new dependencies
- Removed src/index.ts and created app.ts for Elysia server initialization
- Added environment variable configuration in config/env.ts
- Implemented MQTT adapter in adapter/mqtt.ts for message handling
- Created Prisma client in prisma/client.ts and defined schema in prisma/schema.prisma
- Added seeding script in prisma/seed.ts for measurement points
- Established logging utility in utils/logger.ts for structured logging
- Created bed router in routes/bed.ts for handling bed-related routes

.gitignore

@@ -39,4 +39,11 @@ yarn-error.log*
 **/*.tgz
 **/*.log
 package-lock.json
-**/*.bun
+**/*.bun
+/generated/prisma
+
+/generated/prisma
+
+/generated/prisma
+
+/data.db