feat(mobile-api): Android contract coherence (plugin settings, loan, availability, OpenAPI)

[fabiodalez-dev]

Consolidated mobile-API ⇄ Android contract work. Supersedes #191 and #193 (their changes are included here) and adds:

Backend

• Plugin settings reachable + saveable — generic Impostazioni button for any plugin with a settings page; POST delegates self-rendering pages to settingsPage() so the Mobile API access toggle persists.
• Loan vs reservation — desired_date empty or today on an available book is an immediate loan, not a reservation.
• Availability calendar contract — CatalogController::normalizeMobileAvailabilityDays maps website labels to the app's free|partial|full states.
• OpenAPI coherence — the generated spec aligned with the live endpoints.
• E2E: mobile-api-behaviors + idempotency updated.

Verification: PHPStan L5 clean · 57 mobile-api E2E pass.

The matching Android changes (register/forgot UI, feature-flag gating, contract alignment) are in the Android repo's companion PR.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: f2a29932-2d66-4ab7-85dd-ea5dae9893ed

📥 Commits

Reviewing files that changed from the base of the PR and between 1a752ec and da0508d.

📒 Files selected for processing (7)

• app/Controllers/PluginController.php
• app/Views/admin/plugins.php
• storage/plugins/mobile-api/src/Controllers/ActionsController.php
• storage/plugins/mobile-api/src/Controllers/CatalogController.php
• storage/plugins/mobile-api/src/Controllers/OpenApiController.php
• tests/mobile-api-behaviors.spec.js
• tests/mobile-api-idempotency.spec.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/mobile-api-android-coherence

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