feat(03-01): create 7 core models and 3 service interfaces for Phase 3

- StorageNode, StorageScanOptions models
- SearchResult, SearchOptions models
- DuplicateItem, DuplicateGroup, DuplicateScanOptions models
- IStorageService, ISearchService, IDuplicatesService interfaces

SharepointToolbox/Core/Models/DuplicateGroup.cs

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+namespace SharepointToolbox.Core.Models;
+
+public class DuplicateGroup
+{
+    public string GroupKey { get; set; } = string.Empty;
+    public string Name { get; set; } = string.Empty;
+    public List<DuplicateItem> Items { get; set; } = new();
+}

SharepointToolbox/Core/Models/DuplicateItem.cs

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+namespace SharepointToolbox.Core.Models;
+
+public class DuplicateItem
+{
+    public string Name { get; set; } = string.Empty;
+    public string Path { get; set; } = string.Empty;
+    public string Library { get; set; } = string.Empty;
+    public long? SizeBytes { get; set; }
+    public DateTime? Created { get; set; }
+    public DateTime? Modified { get; set; }
+    public int? FolderCount { get; set; }
+    public int? FileCount { get; set; }
+}

SharepointToolbox/Core/Models/DuplicateScanOptions.cs

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+namespace SharepointToolbox.Core.Models;
+
+public record DuplicateScanOptions(
+    string Mode = "Files",          // "Files" or "Folders"
+    bool MatchSize = true,
+    bool MatchCreated = false,
+    bool MatchModified = false,
+    bool MatchSubfolderCount = false,
+    bool MatchFileCount = false,
+    bool IncludeSubsites = false,
+    string? Library = null
+);

SharepointToolbox/Core/Models/SearchOptions.cs

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+namespace SharepointToolbox.Core.Models;
+
+public record SearchOptions(
+    string[] Extensions,
+    string? Regex,
+    DateTime? CreatedAfter,
+    DateTime? CreatedBefore,
+    DateTime? ModifiedAfter,
+    DateTime? ModifiedBefore,
+    string? CreatedBy,
+    string? ModifiedBy,
+    string? Library,
+    int MaxResults,
+    string SiteUrl
+);

SharepointToolbox/Core/Models/SearchResult.cs

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+namespace SharepointToolbox.Core.Models;
+
+public class SearchResult
+{
+    public string Title { get; set; } = string.Empty;
+    public string Path { get; set; } = string.Empty;
+    public string FileExtension { get; set; } = string.Empty;
+    public DateTime? Created { get; set; }
+    public DateTime? LastModified { get; set; }
+    public string Author { get; set; } = string.Empty;
+    public string ModifiedBy { get; set; } = string.Empty;
+    public long SizeBytes { get; set; }
+}

SharepointToolbox/Core/Models/StorageNode.cs

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+namespace SharepointToolbox.Core.Models;
+
+public class StorageNode
+{
+    public string Name { get; set; } = string.Empty;
+    public string Url { get; set; } = string.Empty;
+    public string SiteTitle { get; set; } = string.Empty;
+    public string Library { get; set; } = string.Empty;
+    public long TotalSizeBytes { get; set; }
+    public long FileStreamSizeBytes { get; set; }
+    public long VersionSizeBytes => Math.Max(0L, TotalSizeBytes - FileStreamSizeBytes);
+    public long TotalFileCount { get; set; }
+    public DateTime? LastModified { get; set; }
+    public int IndentLevel { get; set; }
+    public List<StorageNode> Children { get; set; } = new();
+}

SharepointToolbox/Core/Models/StorageScanOptions.cs

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+namespace SharepointToolbox.Core.Models;
+
+public record StorageScanOptions(
+    bool PerLibrary = true,
+    bool IncludeSubsites = false,
+    int FolderDepth = 0   // 0 = library root only; >0 = recurse N levels
+);