fix(mobile): register payload + Profile feature-flag gating

[fabiodalez-dev]

Two P2 findings from the mobile review (no APK distributed yet, so fixed app-side):

1. Registration payload mismatch. RegisterRequest / AuthRepository.register only sent nome/cognome/email/password, but the backend AuthController requires telefono, indirizzo, password_confirm, privacy_acceptance (it 422s with privacy_required/missing_fields otherwise). Added the missing fields (snake_case via @SerialName) so the register call matches the contract.

2. Feature-flag gating. ProfileScreen always showed the Notifications and Message the library actions regardless of the instance's notifications/messages flags. Gated them on InstanceFeatures (read via LocalServices), so the app reflects what the library actually exposes.

Verified: ./gradlew :app:compileDebugKotlin → BUILD SUCCESSFUL.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: cd4a85af-122c-4445-8c5b-b0bcfa565e11

📥 Commits

Reviewing files that changed from the base of the PR and between 845ae1f and 5b3b9d0.

📒 Files selected for processing (3)

• app/src/main/java/com/pinakes/app/data/model/Models.kt
• app/src/main/java/com/pinakes/app/data/repository/AuthRepository.kt
• app/src/main/java/com/pinakes/app/ui/screens/profile/ProfileScreen.kt

✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch fix/mobile-register-and-feature-gating

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[fabiodalez-dev]

Superseded by #5 (consolidated Mobile API contract alignment). Changes included there.