refactor: rename email-server-worker to email-worker

Rename directory from email-server-worker to email-worker for clarity and brevity. Update all references in CLAUDE.md documentation.

email-worker/src/routes/metricsRouter.ts

@@ -0,0 +1,19 @@
+import { Router, NextFunction, Request, Response } from "express";
+import createError from 'http-errors';
+import { register } from 'prom-client';
+import { createLogger } from '../lib/logger';
+
+const logger = createLogger("server:metrics");
+
+export const metricsRouter = Router();
+
+metricsRouter.get('/', async (req:Request, res:Response, next:NextFunction) => {
+    // ne mogu dopustiti da prometheus client sruši server
+    try {
+        logger(`⚡️[server]: GET /metrics`);
+        res.set('Content-Type', register.contentType);
+        res.end(await register.metrics());
+    } catch(ex:any) {
+        next(createError(500, (ex as Error).message));
+    }
+});