Add health check functionality and type checking to the project

* Introduced HealthCheck class for system health monitoring.
* Added HealthCheckApiRoutes for readiness endpoint.
* Updated package.json to include TypeScript type checking command.

package.json

@@ -8,7 +8,8 @@
     "format": "prettier --write .",
     "lint": "eslint --max-warnings 0 './src'",
     "prelint:fix": "bun run format",
-    "lint:fix": "eslint --fix './src'"
+    "lint:fix": "eslint --fix './src'",
+    "typecheck": "tsc --noEmit"
   },
   "devDependencies": {
     "@eslint/css": "0.14.1",

src/health/HealthCheck.ts

@@ -0,0 +1,23 @@
+import { LoggerFactory } from "@techniker-me/logger";
+import os from 'os';
+
+export default class HealthCheck {
+    private readonly _logger = LoggerFactory.getLogger('HealthCheck');
+
+  
+    public async checkHealth() {
+        return {
+            status: 'ok',
+            timestamp: new Date().toISOString(),
+            uptime: process.uptime(),
+            memory: process.memoryUsage(),
+            cpu: process.cpuUsage(),
+            memoryTotal: process.platform === 'linux' ? os.totalmem() : undefined,
+            memoryFree: process.platform === 'linux' ? os.freemem() : undefined,
+            cpuUsage: process.cpuUsage(),
+            network: process.platform === 'linux' ? os.networkInterfaces() : undefined,
+            os: process.platform,
+            version: process.version
+        }
+    }
+}

src/health/HealthCheckRoute.ts

@@ -0,0 +1,39 @@
+import type { BunRouteHandler } from '../net/http/BunHttpServer';
+import { LoggerFactory } from "@techniker-me/logger";
+import type HealthCheck from './HealthCheck';
+import type { BunRequest, Server as BunServer } from 'bun';
+    
+    
+
+export class HealthCheckApiRoutes  {
+    private readonly _logger = LoggerFactory.getLogger('HealthCheckRoute');
+    private readonly _healthCheck: HealthCheck;
+
+    constructor(healthCheck: HealthCheck) {
+        this._healthCheck = healthCheck;
+    }
+
+    public getGETRoute(): Record<string, BunRouteHandler>  {
+      return {
+        '/_health/readiness': this.readiness.bind(this)
+      }
+    }
+
+    public getPOSTRoute():  Record<string, BunRouteHandler> {
+      return { }
+    }
+
+    public getPUTRoute():  Record<string, BunRouteHandler> {
+      return { }
+    }
+
+    public getOPTIONSRoute():  Record<string, BunRouteHandler> {
+      return { }
+    }
+
+    private async readiness(_request: BunRequest, _server: BunServer<unknown>): Promise<Response> {
+        const health = await this._healthCheck.checkHealth();
+
+        return new Response(JSON.stringify(health), {status: 200, headers: {'Content-Type': 'application/json'}});
+      }
+}