Add Content-Type header to /api/v2/key request

[yvaskov]

Description and Related Issue(s)

Replaces text/plain with application/json for proper ingestion on the backend.

Checklist for PR author

• I have tested these changes locally.
• I added tests to cover any new functionality, following this guide
• Whenever I fix a bug, I include a regression test to ensure that the bug does not reappear silently.
• If I have added a feature or functionality that is not privacy-compliant (e.g., tracking, analytics, third-party services), I have disabled it for private mode.
• If I have added, changed, renamed, or removed an environment variable
  • I updated the list of environment variables in the documentation
  • I made the necessary changes to the validator script according to the guide
  • I added "ENVs" label to this pull request

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Note

Low Risk
Low risk: adds an explicit Content-Type: application/json header to an existing POST request, with minimal behavioral impact beyond backend request parsing.

Overview
Fixes the rate-limit bypass flow in AppErrorTooManyRequests by explicitly setting Content-Type: application/json on the POST to general:api_v2_key, ensuring the backend correctly treats the payload as JSON.

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