feat(Core): add SearchResults models as pure POCOs

NEW/src/JdeScoping.Core/Models/SearchResults/MisNonMatchSearchResult.cs

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+namespace JdeScoping.Core.Models.SearchResults;
+
+/// <summary>
+/// MIS non-match investigation result.
+/// </summary>
+public sealed class MisNonMatchSearchResult
+{
+    public string WorkCenterCode { get; init; } = string.Empty;
+    public long WorkOrderNumber { get; init; }
+    public DateTime WorkOrderStartDate { get; init; }
+    public decimal JobStepNumber { get; init; }
+    public string JobStepDescription { get; init; } = string.Empty;
+    public DateTime? JobStepEndDate { get; init; }
+    public string FunctionCode { get; init; } = string.Empty;
+    public bool WasJobStepAdded { get; init; }
+    public decimal? MatchedJobStepNumber { get; init; }
+    public string ItemNumber { get; init; } = string.Empty;
+    public string ItemDescription { get; init; } = string.Empty;
+    public string RoutingType { get; init; } = string.Empty;
+}

NEW/src/JdeScoping.Core/Models/SearchResults/MisSearchResult.cs

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+namespace JdeScoping.Core.Models.SearchResults;
+
+/// <summary>
+/// MIS (Manufacturing Instruction Sheet) data result.
+/// </summary>
+public sealed class MisSearchResult
+{
+    public string ItemNumber { get; init; } = string.Empty;
+    public string ItemDescription { get; init; } = string.Empty;
+    public string SequenceNumber { get; init; } = string.Empty;
+    public string MisNumber { get; init; } = string.Empty;
+    public string RevId { get; init; } = string.Empty;
+    public string Status { get; init; } = string.Empty;
+    public DateTime? ReleaseDate { get; init; }
+    public string BranchCode { get; init; } = string.Empty;
+    public decimal JobStepSequenceNumber { get; init; }
+    public decimal? MatchedSequenceNumber { get; init; }
+    public bool RoutingMatch { get; init; }
+    public bool MasterMatch { get; init; }
+    public string FunctionOperationDescription { get; init; } = string.Empty;
+    public string CharNumber { get; init; } = string.Empty;
+    public string TestDescription { get; init; } = string.Empty;
+    public string SamplingType { get; init; } = string.Empty;
+    public string SamplingValue { get; init; } = string.Empty;
+    public string ToolsGauges { get; init; } = string.Empty;
+    public string WorkInstructions { get; init; } = string.Empty;
+}

NEW/src/JdeScoping.Core/Models/SearchResults/SearchModel.cs

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+namespace JdeScoping.Core.Models.SearchResults;
+
+/// <summary>
+/// Aggregates search metadata and results for export.
+/// </summary>
+public class SearchModel
+{
+    public int Id { get; set; }
+    public string UserName { get; set; } = string.Empty;
+    public string Name { get; set; } = string.Empty;
+    public DateTime? SubmitDt { get; set; }
+    public DateTime? StartDt { get; set; }
+    public DateTime? EndDt { get; set; }
+    public bool ExtractMisData { get; set; }
+
+    public List<SearchResult> Results { get; set; } = [];
+    public List<MisSearchResult> MisResults { get; set; } = [];
+    public List<MisNonMatchSearchResult> MisNonMatchResults { get; set; } = [];
+}

NEW/src/JdeScoping.Core/Models/SearchResults/SearchResult.cs

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+namespace JdeScoping.Core.Models.SearchResults;
+
+/// <summary>
+/// JDE search result - work order with current status.
+/// </summary>
+public sealed class SearchResult
+{
+    public long WorkOrderNumber { get; init; }
+    public string WorkOrderBranchCode { get; init; } = string.Empty;
+    public string LotNumber { get; init; } = string.Empty;
+    public string ItemNumber { get; init; } = string.Empty;
+    public string PlanningFamily { get; init; } = string.Empty;
+    public string StockingType { get; init; } = string.Empty;
+    public decimal OrderQuantity { get; init; }
+    public decimal HeldQuantity { get; init; }
+    public decimal ScrappedQuantity { get; init; }
+    public decimal ShippedQuantity { get; init; }
+    public string StepBranchCode { get; init; } = string.Empty;
+    public decimal StepNumber { get; init; }
+    public string StepDescription { get; init; } = string.Empty;
+    public string FunctionOperationDescription { get; init; } = string.Empty;
+    public DateTime StepUpdateDt { get; init; }
+    public string StatusCode { get; init; } = string.Empty;
+    public string StatusDescription { get; init; } = string.Empty;
+    public DateTime? StatusUpdateDt { get; init; }
+
+    // Inclusion flags
+    public bool ManuallySpecified { get; init; }
+    public bool SplitOrder { get; init; }
+    public bool Cardex { get; init; }
+    public bool PartsList { get; init; }
+    public bool Flagged { get; init; }
+
+    /// <summary>
+    /// Computed reason why this work order was included in results.
+    /// </summary>
+    public string InclusionReason => (ManuallySpecified, Flagged, Cardex, PartsList, SplitOrder) switch
+    {
+        (true, _, _, _, _) => "ManuallySpecified",
+        (_, true, _, _, _) => "Flagged",
+        (_, _, true, true, _) => "ComponentUsage (CARDEX + Parts List)",
+        (_, _, true, false, _) => "ComponentUsage (CARDEX)",
+        (_, _, false, true, _) => "ComponentUsage (Parts List)",
+        (_, _, _, _, true) => "Split order",
+        _ => "UNKNOWN"
+    };
+}