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

config/env.ts

@@ -0,0 +1,58 @@
+import { cleanEnv, str, bool, port, url, host } from "envalid";
+
+const env = cleanEnv(process.env, {
+    BACKEND_PORT: port({
+        desc: "The port for the backend server",
+        default: 3000,
+    }),
+
+    DATABASE_URL: url({
+        desc: "The URL for the database connection",
+    }),
+
+    // Redis configuration
+    REDIS_HOST: host({
+        desc: "The host for the Redis server",
+        default: "localhost",
+    }),
+    REDIS_PORT: port({
+        desc: "The port for the Redis server",
+        default: 6379,
+    }),
+    REDIS_PASSWORD: str({
+        desc: "The password for the Redis server",
+    }),
+
+    // S3 configuration
+    S3_ENDPOINT: host({
+        desc: "The endpoint for the S3 service",
+        default: "localhost",
+    }),
+    S3_BUCKET: str({
+        desc: "The name of the S3 bucket",
+        default: "my-bucket",
+    }),
+    S3_PORT: port({
+        desc: "The port for the S3 service",
+        default: 9000,
+    }),
+    S3_USE_SSL: bool({
+        desc: "Use SSL for S3 service",
+        default: false,
+    }),
+    S3_ACCESS_KEY: str({
+        desc: "Access key for the S3 service",
+    }),
+    S3_SECRET_KEY: str({
+        desc: "Secret key for the S3 service",
+    }),
+
+    // Log Level configuration
+    LOG_LEVEL: str({
+        desc: "The log level for the application",
+        choices: ["debug", "info", "warn", "error", "silent"],
+        default: "info",
+    }),
+});
+
+export default env;