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

Services/Management/IUserManagementService.cs

@@ -0,0 +1,21 @@
+using Foxel.Models;
+using Foxel.Models.Response.User;
+
+namespace Foxel.Services.Management;
+
+public interface IUserManagementService
+{
+    Task<PaginatedResult<UserResponse>> GetUsersAsync(int page = 1, int pageSize = 10);
+    Task<UserResponse> GetUserByIdAsync(int id);
+    Task<UserResponse> CreateUserAsync(string userName, string email, string password, string role);
+    Task<UserResponse> UpdateUserAsync(int id, string userName, string email, string role);
+    Task<bool> DeleteUserAsync(int id);
+    Task<BatchDeleteResult> BatchDeleteUsersAsync(List<int> ids);
+}
+
+public class BatchDeleteResult
+{
+    public int SuccessCount { get; set; }
+    public int FailedCount { get; set; }
+    public List<int> FailedIds { get; set; } = new();
+}