thumbnail service wip

AobaCore/Services/AobaIndexCreationService.cs

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+using AobaCore.Models;
+
+using Microsoft.Extensions.Hosting;
+
+using MongoDB.Driver;
+
+namespace AobaCore.Services;
+
+public class AobaIndexCreationService(IMongoDatabase db): BackgroundService
+{
+	private readonly IMongoCollection<Media> _media = db.GetCollection<Media>("media");
+
+	protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+	{
+		var textKeys = Builders<Media>.IndexKeys
+			.Text(m => m.Filename);
+
+		var textModel = new CreateIndexModel<Media>(textKeys, new CreateIndexOptions
+		{
+			Name = "Text",
+			Background = true
+		});
+
+		await _media.EnsureIndexAsync(textModel);
+	}
+}