Create or replace a file in an application

Writes the provided content to the given path. Writes to squarecloud.app / squarecloud.config are parsed as platform config (display name, description, memory, autorestart, subdomain) and trigger plan/quota validation.

Requires the workspace Maintainer or Administrator role (or ownership) when called against a workspace-shared application. Config rewrites are rate limited to 1 request every 15 seconds per user.