Hide unfinished Ask Posnic from Features

[sridharkalaibala]

Ask Posnic is not ready for public opt-in. Remove its card from Features so it no longer appears in the grid, search, filters or counts, and remove the disabled-state links directing users to enable it there. Retain the hidden saved-value carrier so saving unrelated settings preserves existing configuration.

Validation: 68 relevant feature, settings, Ask Posnic and translation checks passed; production frontend build passed; DOM inspection confirms 25 feature cards with no Ask Posnic card; attribution and whitespace checks passed.

This changes presentation only. Existing saved settings, API permissions and sync behavior are unchanged; no migration or Gateway/agent change is needed.

[github-actions]

Merged to develop. Anyone can test this - you do not need write access.

Try it at https://develop.posnic.io, or run it yourself:

git fetch origin develop && git checkout develop
npm install && npm --prefix api install
npm run dev   # then http://localhost:3000

When you have tested it, say what you did and what happened, and set
QA passed or QA failed. If you cannot set labels, just comment -
a maintainer will.

Reporting that something is broken is as useful as fixing it. It is
better found here than by a shopkeeper.