fix architecture and write new tests

apps/api/src/middleware/requestId.ts

@@ -0,0 +1,10 @@
+import crypto from 'crypto'
+import type { Request, Response, NextFunction } from 'express'
+
+export function requestIdMiddleware(req: Request, res: Response, next: NextFunction) {
+  const incoming = req.headers['x-request-id']
+  const requestId = Array.isArray(incoming) ? incoming[0] : incoming
+  req.requestId = requestId && requestId.length <= 128 ? requestId : `req_${crypto.randomUUID()}`
+  res.setHeader('X-Request-Id', req.requestId)
+  next()
+}