feat: implement AI-driven knowledge extraction service with semantic caching and persistent storage

src/NexusReader.Web.New/Program.cs

@@ -26,7 +26,7 @@ builder.Services.AddScoped<IFocusModeService, FocusModeService>();
 builder.Services.AddScoped<IReaderNavigationService, ReaderNavigationService>();
 
 builder.Services.AddApplication();
-builder.Services.AddInfrastructure();
+builder.Services.AddInfrastructure(builder.Configuration);
 
 var app = builder.Build();
 

src/NexusReader.Web.New/appsettings.json

@@ -5,5 +5,14 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "*",
+  "ConnectionStrings": {
+    "SqliteConnection": "Data Source=nexus.db"
+  },
+  "Ai": {
+    "Google": {
+      "ApiKey": "PLACEHOLDER",
+      "Model": "gemini-1.5-flash"
+    }
+  }
 }