feat(intelligence): implement global hybrid search engine and monetization logic

- Created IUserLibraryStore and IVectorSearchStore abstractions to decouple relational DB and Qdrant gRPC logic from Application Layer
- Implemented MediatR GetGlobalIntelligenceQuery with value-first teaser RAG monetization logic
- Registered new request and response DTOs in AppJsonContext for Native AOT source-generated serialization
- Bound RagMonetizationOptions via IOptions pattern in appsettings.json configuration
- Added POST /api/intelligence endpoint on server and implemented GetGlobalIntelligenceAsync in WASM client service
- Refactored Intelligence.razor to consume the backend-driven global hybrid search Q&A engine

src/NexusReader.Web/Program.cs

@@ -36,6 +36,11 @@ builder.Services.AddRazorComponents()
     .AddInteractiveServerComponents()
     .AddInteractiveWebAssemblyComponents();
 
+builder.Services.ConfigureHttpJsonOptions(options =>
+{
+    options.SerializerOptions.TypeInfoResolverChain.Insert(0, NexusReader.Application.Common.AppJsonContext.Default);
+});
+
 // Enable detailed circuit errors for Server‑Side Blazor components
 builder.Services.AddServerSideBlazor()
     .AddCircuitOptions(options =>
@@ -415,6 +420,23 @@ knowledgeApi.MapDelete("/", async (IKnowledgeService knowledgeService) =>
     return Results.BadRequest(errorMsg);
 });
 
+app.MapPost("/api/intelligence", async (
+    [FromBody] NexusReader.Application.Queries.Intelligence.GetGlobalIntelligenceRequest request,
+    ClaimsPrincipal user,
+    IMediator mediator) =>
+{
+    var userId = user.FindFirstValue(ClaimTypes.NameIdentifier);
+    if (string.IsNullOrEmpty(userId)) return Results.Unauthorized();
+    
+    var tenantId = user.FindFirstValue("TenantId") ?? "global";
+    
+    var result = await mediator.Send(new NexusReader.Application.Queries.Intelligence.GetGlobalIntelligenceQuery(request.QueryText, userId, tenantId));
+    if (result.IsSuccess) return Results.Ok(result.Value);
+    
+    var errorMsg = result.Errors.Count > 0 ? result.Errors[0].Message : "Failed to execute global intelligence query";
+    return Results.BadRequest(errorMsg);
+}).RequireAuthorization();
+
 app.MapPost("/api/library/ingest", async ([FromBody] IngestEbookRequest request, ClaimsPrincipal user, IMediator mediator) =>
 {
     var userId = user.FindFirstValue(ClaimTypes.NameIdentifier);