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feat(recommendations): implement contextual recommendation engine (#76)

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Resolves #75

### Description
This pull request implements a smart, Native AOT-compliant contextual recommendation engine for the desktop dashboard to drive user retention and cross-book monetization.

### Key Changes
1. **Application Layer**:
   - Declared `IUserReadingStateStore` interface to decouple reading state discovery.
   - Added `IVectorSearchStore.SearchGlobalExcludeAsync(...)` to abstract semantic similarity searches with exclusions.
   - Defined `GetContextualRecommendationsQuery` and response DTOs (`ContextualRecommendationResponse`, `RecommendationDto`).
2. **Infrastructure Layer**:
   - Implemented `UserReadingStateStore` using EF Core with DbContext pooling.
   - Implemented `SearchGlobalExcludeAsync` in `VectorSearchStore` to construct gRPC Qdrant filters (excluding the active book ID) and fetch `bookTitle` and `chapterTitle` from point payloads.
   - Implemented `GetContextualRecommendationsQueryHandler` using clean abstractions.
3. **Web & Serialization Layer**:
   - Mapped `GET /api/recommendations` endpoint.
   - Registered types in `AppJsonContext.cs` for AOT-compliant JSON serialization.
4. **Verification**:
   - Added complete unit test coverage in `GetContextualRecommendationsQueryTests.cs`. All 30 unit tests pass.

---------

Co-authored-by: Marek Jasiński <jasins.marek@gmail.com>
Reviewed-on: #76
Co-authored-by: Antigravity <antigravity@google.com>
Co-committed-by: Antigravity <antigravity@google.com>
This commit was merged in pull request #76.
This commit is contained in:
Antigravity
2026-06-06 13:38:48 +00:00
committed by Marek Jaisński
parent bcd5daa3a0
commit 1d6862016d
42 changed files with 2737 additions and 337 deletions
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src/NexusReader.Application/Common/AppJsonContext.cs
+7
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@@ -1,5 +1,7 @@
using System.Text.Json.Serialization;
using System.Collections.Generic;
using NexusReader.Application.Queries.Graph;
using NexusReader.Application.Queries.Intelligence;
namespace NexusReader.Application.Common;
@@ -9,6 +11,11 @@ namespace NexusReader.Application.Common;
[JsonSerializable(typeof(GraphDataDto))]
[JsonSerializable(typeof(List<GraphNodeDto>))]
[JsonSerializable(typeof(List<GraphLinkDto>))]
[JsonSerializable(typeof(GetGlobalIntelligenceRequest))]
[JsonSerializable(typeof(IntelligenceResponse))]
[JsonSerializable(typeof(NexusReader.Application.Queries.Recommendations.ContextualRecommendationResponse))]
[JsonSerializable(typeof(NexusReader.Application.Queries.Recommendations.RecommendationDto))]
[JsonSerializable(typeof(List<NexusReader.Application.Queries.Recommendations.RecommendationDto>))]
public partial class AppJsonContext : JsonSerializerContext
{
}