feat(transport): add IBundleExporter / IBundleImporter interfaces

src/ScadaLink.Commons/Interfaces/Transport/IAuditCorrelationContext.cs

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+namespace ScadaLink.Commons.Interfaces.Transport;
+
+/// <summary>
+/// Scoped service the bundle importer sets to thread a BundleImportId through to
+/// the audit log entries emitted by the audited repository methods invoked during
+/// ApplyAsync. AuditService reads this and stamps every AuditLogEntry it writes.
+/// </summary>
+public interface IAuditCorrelationContext
+{
+    Guid? BundleImportId { get; set; }
+}

src/ScadaLink.Commons/Interfaces/Transport/IBundleExporter.cs

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+using ScadaLink.Commons.Types.Transport;
+
+namespace ScadaLink.Commons.Interfaces.Transport;
+
+public interface IBundleExporter
+{
+    Task<Stream> ExportAsync(
+        ExportSelection selection,
+        string user,
+        string sourceEnvironment,
+        string? passphrase,
+        CancellationToken cancellationToken = default);
+}

src/ScadaLink.Commons/Interfaces/Transport/IBundleImporter.cs

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+using ScadaLink.Commons.Types.Transport;
+
+namespace ScadaLink.Commons.Interfaces.Transport;
+
+public interface IBundleImporter
+{
+    Task<BundleSession> LoadAsync(Stream bundleStream, string? passphrase, CancellationToken ct = default);
+    Task<ImportPreview> PreviewAsync(Guid sessionId, CancellationToken ct = default);
+    Task<ImportResult> ApplyAsync(
+        Guid sessionId,
+        IReadOnlyList<ImportResolution> resolutions,
+        string user,
+        CancellationToken ct = default);
+}

src/ScadaLink.Commons/Interfaces/Transport/IBundleSessionStore.cs

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+using ScadaLink.Commons.Types.Transport;
+
+namespace ScadaLink.Commons.Interfaces.Transport;
+
+public interface IBundleSessionStore
+{
+    BundleSession Open(BundleSession session);
+    BundleSession? Get(Guid sessionId);
+    void Remove(Guid sessionId);
+    void EvictExpired();
+}