chore: Add iOS and Android Remote Verification Tutorial sample apps

[avner-m]

Adds two new sample apps that accompany the Remote mobile verifiers tutorial. Both verify an mDoc presented by a same-device wallet over OID4VP / ISO 18013-7 Annex B, mirroring the existing in-person verifier samples.

A developer can download either project, set their bundle identifier / applicationId, fill in the tenant host and application id, and run on a device. Tenant configuration is handled out of band against MATTR VII (verifier application configuration, supported wallet, trusted issuer) and isn't covered by the apps.

iOS — ios-remote-verification-tutorial-sample-app/

• SwiftUI + MobileCredentialVerifierSDK (Embed & Sign xcframework, added by the developer per the README).
• URL scheme in Remote-verification-tutorial-Info.plist is bound to $(PRODUCT_BUNDLE_IDENTIFIER), so the deep link tracks whatever bundle id the developer sets without manual edits.
• No CodeScanner / certificate management / QR scanner — the remote workflow doesn't need them.

Android — android-remote-verification-tutorial-sample-app/

• Jetpack Compose + global.mattr.mobilecredential:verifier:6.1.0 (resolved from the local repo/ directory, populated from the SDK distribution).
• OID4VP callback <intent-filter> is bound to \${applicationId}, so the scheme tracks the package name set in app/build.gradle.kts.
• local.properties is intentionally not committed (the in-person sample's committed copy contains a personal sdk.dir path — same class of PII the recent chore: Remove personal identifiers commit was cleaning up).

PII removed vs. the tutorial

• iOS Constants.swift: tenantHost and applicationID replaced with your-tenant.vii.your-region.mattr.global / your-application-id. The URL still parses so the app launches; a credential request returns an error until real values are set.
• Android Constants.kt: TENANT_HOST and APPLICATION_ID replaced with matching placeholders.
• Tutorial's hardcoded bundle id / package name / URL scheme replaced with \$(PRODUCT_BUNDLE_IDENTIFIER) (iOS) and \${applicationId} (Android).

Not done

• I didn't build either app — the SDK distributions aren't in the repo by design, matching the existing in-person samples. The code is validated by inspection against the tutorial and the working in-person samples it mirrors.

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