[PM-43126] Add NixgramX to FIDO2 community privileged allow list

[Anndy999]

Summary

Adds app.nixgramx.android to fido2_privileged_community.json so Bitwarden can honor Credential Manager setOrigin(https://telegram.org) from this open-source Telegram client fork.

Official Telegram uses telegram.org Digital Asset Links (unavailable to forks). Without an allowlist entry, passkeys fail with origin/signature errors unless the user somehow trusts the caller.

App details

• Package: app.nixgramx.android
• Release cert SHA-256: 52:54:81:59:97:91:41:62:6E:E5:B4:07:B8:4E:E7:0A:33:44:ED:91:29:7F:5F:BE:8E:91:DF:8F:0C:29:A3:1C
• Source: https://github.com/Anndy999/NixgramX

Test plan

• Asset/JSON CI checks pass
• Bitwarden build with this entry: NixgramX passkey flow with preferred provider Bitwarden

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

NixgramX seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

NixgramX seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[bitwarden-bot]

Thank you for your contribution! We've added this to our internal tracking system for review.
ID: PM-43126
Link: https://bitwarden.atlassian.net/browse/PM-43126

Details on our contribution process can be found here: https://contributing.bitwarden.com/contributing/pull-requests/community-pr-process.