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The ChicoryTV React SPA (web/, served at /app) now has full parity for every route the Blazor UI served, so the legacy Blazor Server / MudBlazor UI is deleted. This is the milestone-capping removal of #91 phase (b). Deleted: ErsatzTV/Pages/**, Shared/**, ViewModels/** (39 edit VMs), Validators/** (10 edit-VM validators), App.razor, _Imports.razor, Locals/{Shared,Pages}/** (Blazor loc resx; Locals/Resources.* kept), wwwroot/css + wwwroot/lib, libman.json, and the orphaned MultiSelectBaseTests. Startup.cs (surgical, not wholesale): removed AddRazorPages/AuthorizeFolder, AddServerSideBlazor, AddMudServices, AddSortable, AddCourier, the HtmlSanitizer registration, the Blazor-attached OIDC UseAuthentication/UseAuthorization middleware (per the #206 auth-posture sign-off), MapBlazorHub, and MapFallbackToPage("/_Host"). Renamed the branch blazor->legacy; it still co-hosts MapControllers, /docs (Scalar), dev MapOpenApi and the redirect middleware. Replaced the _Host fallback with a catch-all (MapFallback -> 302 /app) that excludes /api|/artwork|/docs|/openapi (genuine 404) per #204. Kept all OIDC/JWT/API-key service wiring (inert unless configured; real auth is #197), ConditionalIptvAuthorizeFilter, ApiKeyAuthorizationFilter. Pruned 9 now-unused packages (all verified zero remaining consumers) from Directory.Packages.props + ErsatzTV.csproj: MudBlazor, Heron.MudCalendar, Blazored.FluentValidation, BlazorSortable, MediatR.Courier.DependencyInjection, Markdig, HtmlSanitizer, Chronic.Core, NaturalSort.Extension. Also removed the now-dead #25 razor-Sonar NoWarn. LegacyUiRedirects: added the 14 /media/sources/* -> /app/libraries/* redirects (SPA screens landed in #202) and lifted the #204-era /media/sources prefix ban. Tests: Release build clean; full solution suite green. Updated Startup source-text tests + added regression coverage that Blazor wiring is gone, the catch-all is wired, and all 14 media-sources routes redirect. Docs: blazor-route-parity.md (phase b COMPLETE), decisions.md (removal entry), CLAUDE.md, contributing.md, README.md all updated in this PR. Rollback: tag blazor-final is cut on pre-merge main as the first merge action. Part of #91. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>