Support Local dev experience for API Management backend

**Is your feature request related to a problem? Please describe.**
I have successfully linked an endpoint in API management. But there is no documentation or example to help me develop the frontend and backend together in a local environment.

**Describe the solution you'd like**

A way to help me to proxy `/api` calls into an API management endpoint. Currently, there is a big gap between this documentation: https://learn.microsoft.com/en-us/azure/static-web-apps/apis-api-management and the ability to successfully develop locally against the management API. I wish to see clear documentation about each place:
- What should my CLI command look like?
- What should my saw-cli.config.json look like?
- What should the `fetch()` call look like?
- What should the API management settings look like?

In addition, are there ways to cURL or Postman against my endpoint? I think that is the bare minimum to get backend development inner loop started.

Beginne mit der verlinkten Dokumentation zu Azure API Management und dem angeforderten lokalen `/api`-Proxy-Ablauf. Dokumentiere den CLI-Befehl, `saw-cli.config.json`, den `fetch()`-Aufruf, die Einstellungen von API Management sowie alle für die lokale Frontend-/Backend-Entwicklung erforderlichen cURL- oder Postman-Schritte. Als erledigt gilt die Aufgabe, wenn ein Neuling dem Beispiel von Anfang bis Ende gegen die management API folgen kann.

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