Add new classes and interfaces for knowledge management

This commit introduces new classes `QuantizedTaskDto`, `KnowledgeStore`, and `KnowledgeHandle`, as well as the interface `IKnowledgeStore` to support knowledge management functionalities. The `KnowledgeStore` class implements the `IKnowledgeStore` interface, providing methods for writing and reading knowledge, while `KnowledgeHandle` is a background service that logs the start of the knowledge service.

Author: 239573049

src/Koala.Application.Contract/knowledge/Dto/QuantizedTaskDto.cs

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+namespace Koala.Application.Contract.knowledge.Dto;
+
+public class QuantizedTaskDto
+{
+    
+}

src/Koala.Application.Contract/knowledge/IKnowledgeStore.cs

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+namespace Koala.Application.Contract.knowledge;
+
+public interface IKnowledgeStore
+{
+    Task Write();
+
+    Task<bool> TryRead();
+}

src/Koala.Application/knowledge/KnowledgeHandle.cs

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+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+
+namespace Koala.Application.knowledge;
+
+public class KnowledgeHandle(ILogger<KnowledgeHandle> logger) : BackgroundService
+{
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        logger.LogInformation("知识库后台服务启动");
+        
+        while (!stoppingToken.IsCancellationRequested)
+        {
+        }
+
+    }
+}

src/Koala.Application/knowledge/KnowledgeStore.cs

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+using Koala.Application.Contract.knowledge;
+
+namespace Koala.Application.knowledge;
+
+public class KnowledgeStore : IKnowledgeStore
+{
+    public Task Write()
+    {
+        throw new NotImplementedException();
+    }
+
+    public Task<bool> TryRead()
+    {
+        throw new NotImplementedException();
+    }
+}