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/app.ts

@@ -0,0 +1,34 @@
+import express from 'express';
+import createError from 'http-errors';
+
+import { errorRouter } from './routes/errorRouter';
+import { finalErrorRouter } from './routes/finalErrorRouter';
+import { metricsRouter } from './routes/metricsRouter';
+import { pingRouter } from './routes/pingRouter';
+import { healthcheckRouter } from './routes/healthcheckRouter';
+
+import { SupportedRoutes } from './types/enums/SupportedRoutes';
+
+const app = express();
+
+// u slučaju kada se server vrti iza proxy-a
+// ovaj flag će natjerati Express da informacije poput
+// IP adrese klijenta, protokola uzima iz X-Forward-*
+// HTTP header polja, koja postavlja proxy
+app.set('trust proxy', true);
+
+// prometheus sa ove rute dohvaća zadnje važeću statistiku
+app.use(SupportedRoutes.metricsPath, metricsRouter);
+app.use(SupportedRoutes.ping, pingRouter);
+app.use(SupportedRoutes.healthcheck, healthcheckRouter);
+
+// default handler
+app.use((req, res, next) => next(createError(404)));
+
+// error handler za sve predviđene greške
+app.use(errorRouter);
+
+// error router za nepredviđene greške
+app.use(finalErrorRouter);
+
+export default app;