nethcti-middleware: Phone Island API key lacks subtype support

[edospadoni]

Problem

The Phone Island API key storage does not support different client types (web vs nethlink), causing session conflicts when users authenticate from multiple clients.

Steps to reproduce

1. Login to nethvoice-cti web interface and generate new integration token (under Settings->Integrations)
2. Use it in a external application and try to make a call (you can clone phone-island project and run npm run dev then use the integration token)
3. Login to nethlink desktop application
4. Go back in the external application and the authentication fails with wrong token error

Root cause

The middleware stores only one phone_island_api_key.json file per user, without distinguishing between client subtypes. Each new login overwrites the previous token, invalidating the other client's session.

Component

nethcti-middleware

[edospadoni]

ns8-nethvoice testing release:

• https://github.com/nethesis/ns8-nethvoice/releases/tag/1.4.6-testing.9

nethlink testing release:

• feat: nethcti-middleware nethlink#72 (comment)

[edospadoni]

Test case:

• check the bug is not reproducible