feat: Add option to use Seerr default quality profiles

[raccommode]

Summary

• Add an Allow users to choose quality toggle under Advanced → Request modal.
• Keep the toggle enabled by default so existing installations retain their current behavior.
• When disabled, movie and TV requests skip the profile picker and use the default Radarr or Sonarr profile configured in Seerr.
• Enforce the setting in the request controller so submitted server/profile/root-folder overrides are ignored when profile selection is disabled.
• Keep the Letterboxd bulk quality workflow independent because it has its own advanced quality settings.

How I tested

• Ran dotnet build SeerrFin.sln -c Release with .NET 9: 0 warnings and 0 errors.
• Ran node --check against every injected JavaScript file and the configuration page script.
• Used a local browser fixture with the real injected modal script and verified:
  • Disabled: the modal displays Submitting request… and sends a POST containing only media type, media ID, and 4K state, without ServerId, ProfileId, or RootFolder.
  • Enabled: the existing quality picker opens and loads request-options/movie.
  • The new toggle is visible and checked by default under Advanced → Request modal.
• Confirmed the new setting and frontend payload are embedded in the Release DLL.

Environment

• Target: Jellyfin 10.11.x / ABI 10.11.0.0
• Build SDK: .NET 9
• Browser validation: local Chromium fixture on macOS

Pending real-instance validation

This PR is intentionally opened as a draft until the behavior has been verified on a real Jellyfin + Seerr installation. The server test should cover both a user with Advanced Requests permission and a standard request-only user, with the toggle enabled and disabled.

AI assistance

OpenAI Codex (GPT-5) was used to inspect the request flow, implement the focused setting, run the .NET/JavaScript checks, and exercise the local browser fixture. The change was kept separate from the localization PR to follow the repository's one-feature-per-PR rule.