feat(intelligence): implement Global AI Q&A screen and paywall blocker

- Implemented standard empty and active chat conversation states for the `/intelligence` page
- Created interactive `AiResponseRenderer` with AOT-compliant sentence splitting and payment gateway simulation
- Added scoped `LibraryStateService` to synchronize book ownership and updates across the application
- Obfuscated paywalled content in DOM to prevent inspection bypass
- Fixed local port connection mismatch by updating API configurations to use port 5104

src/NexusReader.UI.Shared/Pages/MyBooks.razor

@@ -1,11 +1,13 @@
 @page "/my-books"
 @attribute [Authorize]
+@implements IDisposable
 @using NexusReader.UI.Shared.Components.Organisms
 @using NexusReader.Application.DTOs.User
 @using NexusReader.UI.Shared.Services
 @using System.Net.Http.Json
 @inject HttpClient Http
 @inject IReaderNavigationService ReaderNavigation
+@inject ILibraryStateService LibraryStateService
 
 <div class="my-books-page">
     <header class="my-books-header">
@@ -108,6 +110,11 @@
     private bool _isLoading = true;
     private List<LastReadBookDto>? _books;
 
+    protected override void OnInitialized()
+    {
+        LibraryStateService.OnBooksChanged += HandleBooksChanged;
+    }
+
     protected override async Task OnAfterRenderAsync(bool firstRender)
     {
         if (firstRender)
@@ -116,6 +123,11 @@
         }
     }
 
+    private void HandleBooksChanged()
+    {
+        _ = InvokeAsync(LoadBooksAsync);
+    }
+
     private async Task LoadBooksAsync()
     {
         _isLoading = true;
@@ -149,4 +161,9 @@
     {
         ReaderNavigation.NavigateToBook(bookId);
     }
+
+    public void Dispose()
+    {
+        LibraryStateService.OnBooksChanged -= HandleBooksChanged;
+    }
 }