Add soft delete + trash, keyboard-first web overhaul, move chapter tags to bottom

Adds SoftDelete/Trash across characters, chapters, locations, beats with a
purge schedule and Trash page. Reworks the web client for keyboard-driven
navigation (focus helpers, help overlay, keyboard.md doc). Moves the
ChapterPage tag editor to the bottom of the page to match CharacterDetailPage.

src/Novelly.Api/Program.cs

@@ -15,6 +15,7 @@ using Novelly.Api.Locations;
 using Novelly.Api.Novels;
 using Novelly.Api.Questions;
 using Novelly.Api.Tags;
+using Novelly.Api.Trash;
 using Novelly.Api.Users;
 using Serilog;
 
@@ -128,7 +129,8 @@ app.MapNovelEndpoints()
    .MapOpenQuestionEndpoints()
    .MapAgentEndpoints()
    .MapImportEndpoints()
-   .MapActivityEndpoints();
+   .MapActivityEndpoints()
+   .MapTrashEndpoints();
 
 app.Run();