refactor: rename ScadaLink → ZB.MOM.WW.ScadaBridge (code + projects + namespaces)

Solution + 23 src projects + 26 test projects renamed; folders, csproj,
namespaces, and ScadaLinkDbContext/ScadaBridgeDbContext class updated.
ActorSystem "scadalink" → "scadabridge", Akka seed-node URLs migrated.
SQL roles/logins, LDAP domains, CLI command name, and CLI config dir
(~/.scadalink → ~/.scadabridge) also renamed.

Build green; 5 Host.Tests fail awaiting SQL login rename in next commit.
Pre-existing StaleTagMonitor timing flakes unchanged.

Rename script committed at tools/rename-to-scadabridge.sh.

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

@@ -0,0 +1,70 @@
+using ZB.MOM.WW.ScadaBridge.Commons.Entities.Instances;
+using ZB.MOM.WW.ScadaBridge.Commons.Entities.Sites;
+
+namespace ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Repositories;
+
+/// <summary>
+/// Repository interface for site and data connection management.
+/// </summary>
+public interface ISiteRepository
+{
+    // Sites
+    /// <summary>Retrieves a site by its ID.</summary>
+    /// <param name="id">The site primary key.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task<Site?> GetSiteByIdAsync(int id, CancellationToken cancellationToken = default);
+    /// <summary>Retrieves a site by its identifier.</summary>
+    /// <param name="siteIdentifier">The unique site identifier string.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task<Site?> GetSiteByIdentifierAsync(string siteIdentifier, CancellationToken cancellationToken = default);
+    /// <summary>Retrieves all sites.</summary>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task<IReadOnlyList<Site>> GetAllSitesAsync(CancellationToken cancellationToken = default);
+    /// <summary>Adds a new site.</summary>
+    /// <param name="site">The site entity to add.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task AddSiteAsync(Site site, CancellationToken cancellationToken = default);
+    /// <summary>Updates an existing site.</summary>
+    /// <param name="site">The site entity with updated values.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task UpdateSiteAsync(Site site, CancellationToken cancellationToken = default);
+    /// <summary>Deletes a site.</summary>
+    /// <param name="id">The site primary key.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task DeleteSiteAsync(int id, CancellationToken cancellationToken = default);
+
+    // Data Connections
+    /// <summary>Retrieves a data connection by its ID.</summary>
+    /// <param name="id">The data connection primary key.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task<DataConnection?> GetDataConnectionByIdAsync(int id, CancellationToken cancellationToken = default);
+    /// <summary>Retrieves all data connections.</summary>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task<IReadOnlyList<DataConnection>> GetAllDataConnectionsAsync(CancellationToken cancellationToken = default);
+    /// <summary>Retrieves all data connections for a site.</summary>
+    /// <param name="siteId">The site primary key to filter by.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task<IReadOnlyList<DataConnection>> GetDataConnectionsBySiteIdAsync(int siteId, CancellationToken cancellationToken = default);
+    /// <summary>Adds a new data connection.</summary>
+    /// <param name="connection">The data connection entity to add.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task AddDataConnectionAsync(DataConnection connection, CancellationToken cancellationToken = default);
+    /// <summary>Updates an existing data connection.</summary>
+    /// <param name="connection">The data connection entity with updated values.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task UpdateDataConnectionAsync(DataConnection connection, CancellationToken cancellationToken = default);
+    /// <summary>Deletes a data connection.</summary>
+    /// <param name="id">The data connection primary key.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task DeleteDataConnectionAsync(int id, CancellationToken cancellationToken = default);
+
+    // Instances (for deletion constraint checks)
+    /// <summary>Retrieves all instances deployed to a site.</summary>
+    /// <param name="siteId">The site primary key to filter by.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task<IReadOnlyList<Instance>> GetInstancesBySiteIdAsync(int siteId, CancellationToken cancellationToken = default);
+
+    /// <summary>Saves all pending changes to the database.</summary>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task<int> SaveChangesAsync(CancellationToken cancellationToken = default);
+}