feat(core): add pipeline viewer DTOs

NEW/src/JdeScoping.Core/ApiContracts/Pipelines/PipelineConfigDto.cs

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+namespace JdeScoping.Core.ApiContracts.Pipelines;
+
+/// <summary>
+/// Pipeline configuration DTO for display.
+/// </summary>
+public record PipelineConfigDto(
+    string Name,
+    PipelineSourceDto Source,
+    PipelineDestinationDto Destination,
+    PipelineSchedulesDto Schedules,
+    int PreScriptCount,
+    int PostScriptCount,
+    List<string>? PreScripts,
+    List<string>? PostScripts);
+
+public record PipelineSourceDto(
+    string Connection,
+    string? QueryPreview,
+    string? MassQueryPreview,
+    string? Query,
+    string? MassQuery,
+    List<PipelineParameterDto> Parameters);
+
+public record PipelineParameterDto(
+    string Name,
+    string? Format,
+    string Source);
+
+public record PipelineDestinationDto(
+    string Table,
+    string OperationType,
+    List<string>? MatchColumns,
+    List<string>? ExcludeFromUpdate);
+
+public record PipelineSchedulesDto(
+    PipelineScheduleDto Mass,
+    PipelineScheduleDto Daily,
+    PipelineScheduleDto Hourly);
+
+public record PipelineScheduleDto(
+    bool Enabled,
+    int IntervalMinutes,
+    bool PrePurge,
+    bool ReIndex,
+    bool IntervalIsOverride,
+    bool PrePurgeIsOverride,
+    bool ReIndexIsOverride);

NEW/src/JdeScoping.Core/ApiContracts/Pipelines/PipelineExecutionDto.cs

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+namespace JdeScoping.Core.ApiContracts.Pipelines;
+
+using JdeScoping.Core.Models.Enums;
+
+/// <summary>
+/// Pipeline execution history.
+/// </summary>
+public record PipelineExecutionsResponse(List<PipelineExecutionDto> Executions);
+
+public record PipelineExecutionDto(
+    UpdateTypes ScheduleType,
+    DateTime StartTime,
+    DateTime? EndTime,
+    TimeSpan? Duration,
+    long RecordCount,
+    bool WasSuccessful);

NEW/src/JdeScoping.Core/ApiContracts/Pipelines/PipelineListResponse.cs

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+namespace JdeScoping.Core.ApiContracts.Pipelines;
+
+/// <summary>
+/// Response containing list of available pipeline names.
+/// </summary>
+public record PipelineListResponse(List<string> PipelineNames);

NEW/src/JdeScoping.Core/ApiContracts/Pipelines/PipelineStatusDto.cs

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+namespace JdeScoping.Core.ApiContracts.Pipelines;
+
+using JdeScoping.Core.Models.Enums;
+
+/// <summary>
+/// Pipeline schedule status for each update type.
+/// </summary>
+public record PipelineStatusResponse(List<PipelineScheduleStatusDto> Statuses);
+
+public record PipelineScheduleStatusDto(
+    UpdateTypes ScheduleType,
+    DateTime? LastRun,
+    bool LastRunWasSuccessful,
+    DateTime? LastSuccessfulRun,
+    DateTime? NextRequiredRun,
+    bool IsOverdue,
+    int IntervalMinutes);