joachimhummel a111d2930d Add rate-limiting to /api/contact to prevent spam ...

Task #11: Formular gegen Spam schützen

- Installed `express-rate-limit` (^8.5.2) as a runtime dependency in
  `@workspace/api-server`
- Created a rate limiter (5 requests per IP per hour, 1-hour sliding window)
  using `rateLimit()` from express-rate-limit
- Applied the limiter as inline middleware on POST /contact so it runs before
  the handler
- On limit exceeded the API returns HTTP 429 with a German-language JSON error:
  { success: false, message: "Zu viele Anfragen. Bitte versuchen Sie es in
  einer Stunde erneut." }
- Uses `standardHeaders: "draft-8"` (RateLimit header group) and disables
  legacy X-RateLimit-* headers
- Added `app.set("trust proxy", 1)` in app.ts so that Express reads the real
  client IP from X-Forwarded-For (set by Replit's reverse proxy), ensuring
  the rate limit is applied per actual client rather than per proxy IP
- No other changes to the contact handler flow

No deviations from the task description.

Replit-Task-Id: de2cecbd-511f-4046-8e87-567ec96e19fb

2026-05-15 16:39:43 +00:00

949 B

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