Add Health/Recommendations/Request/Webhook controllers

src/app/controllers/WebhookController.ts

@@ -0,0 +1,25 @@
+import type { FastifyInstance, FastifyReply, FastifyRequest } from 'fastify';
+import { Controller } from '../../core/server/Controller';
+import type { PromptService } from '../../core/langfuse/PromptService';
+
+interface InvalidateBody {
+  promptName?: string;
+}
+
+export class WebhookController extends Controller {
+  constructor(private readonly promptService: PromptService) {
+    super();
+  }
+
+  register(app: FastifyInstance): void {
+    app.post('/webhooks/langfuse/invalidate', (request, reply) =>
+      this.handle(request as FastifyRequest<{ Body: InvalidateBody }>, reply)
+    );
+  }
+
+  private async handle(request: FastifyRequest<{ Body: InvalidateBody }>, reply: FastifyReply) {
+    const promptName = request.body?.promptName;
+    this.promptService.invalidate(promptName);
+    reply.send({ invalidated: true, promptName: promptName ?? 'all' });
+  }
+}