feat(client): add PipelineApiClient and admin components

- Add IPipelineApiClient interface in Core ApiContracts
- Add PipelineApiClient implementation extending ApiClientBase
- Create Components/Admin directory for admin UI components
- Add SqlQueryModal component for displaying SQL queries with copy-to-clipboard
- Add PipelineScheduleSection component for pipeline schedule display
- Register IPipelineApiClient in Program.cs DI container
- Add Admin components namespace to _Imports.razor

NEW/src/JdeScoping.Core/ApiContracts/IPipelineApiClient.cs

@@ -0,0 +1,22 @@
+using JdeScoping.Core.ApiContracts.Pipelines;
+using JdeScoping.Core.ApiContracts.Results;
+
+namespace JdeScoping.Core.ApiContracts;
+
+/// <summary>
+/// Client contract for pipeline configuration API operations.
+/// </summary>
+public interface IPipelineApiClient
+{
+    /// <summary>Gets list of all available pipeline names.</summary>
+    Task<ApiResult<PipelineListResponse>> GetPipelineNamesAsync(CancellationToken ct = default);
+
+    /// <summary>Gets configuration for a specific pipeline.</summary>
+    Task<ApiResult<PipelineConfigDto>> GetPipelineAsync(string name, CancellationToken ct = default);
+
+    /// <summary>Gets schedule status for a pipeline.</summary>
+    Task<ApiResult<PipelineStatusResponse>> GetStatusAsync(string name, CancellationToken ct = default);
+
+    /// <summary>Gets recent execution history for a pipeline.</summary>
+    Task<ApiResult<PipelineExecutionsResponse>> GetExecutionsAsync(string name, int count = 30, CancellationToken ct = default);
+}