feat: Support multiple vector database selection, add InMemory and Qdrant adapters, introduce admin dashboard

Services/VectorDb/VectorDbInitializer.cs

@@ -0,0 +1,30 @@
+using Foxel.Services.Configuration;
+
+namespace Foxel.Services.VectorDB;
+
+public class VectorDbInitializer : IHostedService
+{
+    private readonly IVectorDbService _vectorDbService;
+    private readonly IConfigService _configService;
+    private const string VectorDbTypeConfigKey = "VectorDb:Type";
+
+    public VectorDbInitializer(IVectorDbService vectorDbService, IConfigService configService)
+    {
+        _vectorDbService = vectorDbService;
+        _configService = configService;
+    }
+
+    public async Task StartAsync(CancellationToken cancellationToken)
+    {
+        var dbTypeStr = await _configService.GetValueAsync(VectorDbTypeConfigKey) ?? "InMemory";
+        if (string.Equals(dbTypeStr, "InMemory", StringComparison.OrdinalIgnoreCase))
+        {
+            await _vectorDbService.BuildUserPictureVectorsAsync();
+        }
+    }
+
+    public Task StopAsync(CancellationToken cancellationToken)
+    {
+        return Task.CompletedTask;
+    }
+}