docs: complete XML doc coverage (returns, summaries, inheritdoc)

Resolve all 622 issues flagged by the enhanced CommentChecker: add missing
<returns> tags (incl. the standard phrasing on non-generic Task methods),
add missing <summary> tags, and replace misused/redundant <inheritdoc/> on
members that override or implement nothing with real documentation.
Documentation-only — no behavior change; solution builds clean.

src/ZB.MOM.WW.ScadaBridge.Commons/Interfaces/Repositories/ICentralUiRepository.cs

@@ -10,30 +10,37 @@ public interface ICentralUiRepository
 {
     /// <summary>Returns all configured sites.</summary>
     /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>A task that resolves to a read-only list of all sites.</returns>
     Task<IReadOnlyList<Site>> GetAllSitesAsync(CancellationToken cancellationToken = default);
     /// <summary>Returns all data connections for the specified site.</summary>
     /// <param name="siteId">The site database ID to filter by.</param>
     /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>A task that resolves to a read-only list of data connections for the site.</returns>
     Task<IReadOnlyList<DataConnection>> GetDataConnectionsBySiteIdAsync(int siteId, CancellationToken cancellationToken = default);
     /// <summary>Returns all data connections across all sites.</summary>
     /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>A task that resolves to a read-only list of all data connections.</returns>
     Task<IReadOnlyList<DataConnection>> GetAllDataConnectionsAsync(CancellationToken cancellationToken = default);
     /// <summary>Returns the full template tree including folders and templates.</summary>
     /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>A task that resolves to a read-only list of templates.</returns>
     Task<IReadOnlyList<Template>> GetTemplateTreeAsync(CancellationToken cancellationToken = default);
     /// <summary>Returns instances filtered by optional site, template, or search term.</summary>
     /// <param name="siteId">Optional site ID to filter by.</param>
     /// <param name="templateId">Optional template ID to filter by.</param>
     /// <param name="searchTerm">Optional keyword to filter instance names.</param>
     /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>A task that resolves to a read-only list of matching instances.</returns>
     Task<IReadOnlyList<Instance>> GetInstancesFilteredAsync(int? siteId = null, int? templateId = null, string? searchTerm = null, CancellationToken cancellationToken = default);
     /// <summary>Returns the most recent deployment records up to the specified count.</summary>
     /// <param name="count">Maximum number of records to return.</param>
     /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>A task that resolves to a read-only list of recent deployment records.</returns>
     Task<IReadOnlyList<DeploymentRecord>> GetRecentDeploymentsAsync(int count, CancellationToken cancellationToken = default);
     /// <summary>Returns the area tree for the specified site.</summary>
     /// <param name="siteId">The site database ID.</param>
     /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>A task that resolves to a read-only list of areas for the site.</returns>
     Task<IReadOnlyList<Area>> GetAreaTreeBySiteIdAsync(int siteId, CancellationToken cancellationToken = default);
 
     // Audit log queries
@@ -51,6 +58,7 @@ public interface ICentralUiRepository
     /// <param name="page">One-based page number.</param>
     /// <param name="pageSize">Number of entries per page.</param>
     /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>A task that resolves to a tuple of the matching entries and the total count.</returns>
     Task<(IReadOnlyList<AuditLogEntry> Entries, int TotalCount)> GetAuditLogEntriesAsync(
         string? user = null,
         string? entityType = null,
@@ -66,5 +74,6 @@ public interface ICentralUiRepository
 
     /// <summary>Persists pending changes to the underlying store.</summary>
     /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>A task that resolves to the number of entities written.</returns>
     Task<int> SaveChangesAsync(CancellationToken cancellationToken = default);
 }