Added ability to remove all records from the database.

VectorSearchApp/Services/QdrantService.cs

@@ -11,6 +11,7 @@ public interface IQdrantService
     Task StoreAddressAsync(Address address, float[] embedding, CancellationToken cancellationToken = default);
     Task<List<AddressEmbedding>> SearchSimilarAddressesAsync(float[] queryEmbedding, int limit = 5, float scoreThreshold = 0.0f, CancellationToken cancellationToken = default);
     Task<List<AddressEmbedding>> GetAllAddressesAsync(CancellationToken cancellationToken = default);
+    Task DeleteAllAddressesAsync(CancellationToken cancellationToken = default);
 }
 
 public class QdrantService : IQdrantService
@@ -86,4 +87,9 @@ public class QdrantService : IQdrantService
         }
         return addresses;
     }
+
+    public async Task DeleteAllAddressesAsync(CancellationToken cancellationToken = default)
+    {
+        await _client.DeleteAsync(_collectionName, filter: new Filter(), cancellationToken: cancellationToken);
+    }
 }