Enhance API routing and health check functionality

- Added ApiRouteTemplate as a base class for defining API routes
- Implemented HealthCheckApi for health check endpoint management
- Introduced IApiRoute interface for consistent route handling
- Updated UserApiRoute to align with new routing structure
- Added HealthCheck class for health status retrieval
- Improved dependency management with new types and interfaces

src/api/HealthCheckApi.ts

@@ -0,0 +1,43 @@
+import type {HealthCheck} from '../health/HealthCheck.js';
+import type {RoutePath, RouteHandler} from '../net/http/HttpRouteManger.js';
+import type {IApiRoute} from './IApiRoute';
+import type express from 'express';
+
+export class HealthCheckApi implements IApiRoute {
+  private readonly _getRoutes: Record<string, RouteHandler>;
+  private readonly _postRoutes: Record<string, RouteHandler> = {};
+  private readonly _putRoutes: Record<string, RouteHandler> = {};
+  private readonly _deleteRoutes: Record<string, RouteHandler> = {};
+  private readonly _healthCheck: HealthCheck;
+
+  constructor(healthCheck: HealthCheck) {
+    this._healthCheck = healthCheck;
+    this._getRoutes = this.setupGETRoutes();
+  }
+
+  public getGETRoutes(): Record<RoutePath, RouteHandler> {
+    return this._getRoutes;
+  }
+
+  public getPOSTRoutes(): Record<RoutePath, RouteHandler> {
+    return this._postRoutes;
+  }
+
+  public getPUTRoutes(): Record<RoutePath, RouteHandler> {
+    return this._putRoutes;
+  }
+
+  public getDELETERoutes(): Record<RoutePath, RouteHandler> {
+    return this._deleteRoutes;
+  }
+
+  private setupGETRoutes(): Record<RoutePath, RouteHandler> {
+    return {
+      '/_health': (req: express.Request, res: express.Response) => {
+        const health = this._healthCheck.getHealth();
+
+        res.send(health);
+      }
+    };
+  }
+}