feat(configmanager): add dedicated SQL Server port control

Add SqlServerPort property to connection string editor for explicit port
configuration, replacing the need to embed port in server name (e.g.,
localhost,1434). The port control generates the comma-separated format in
the connection string but does not parse it back when loading existing
connection strings.

NEW/tests/JdeScoping.ConfigManager.Tests/Models/ConnectionStringEntryTests.cs

@@ -107,6 +107,7 @@ public class ConnectionStringEntryTests
         entry.Name.ShouldBe(string.Empty);
         entry.Provider.ShouldBe(ConnectionProvider.Generic);
         entry.Server.ShouldBeNull();
+        entry.SqlServerPort.ShouldBeNull();
         entry.Database.ShouldBeNull();
         entry.UserId.ShouldBeNull();
         entry.Password.ShouldBeNull();
@@ -119,4 +120,70 @@ public class ConnectionStringEntryTests
         entry.ServiceName.ShouldBeNull();
         entry.RawConnectionString.ShouldBeNull();
     }
+
+    [Fact]
+    public void GenerateConnectionString_SqlServer_WithPort_IncludesPortInServer()
+    {
+        // Arrange
+        var entry = new ConnectionStringEntry
+        {
+            Provider = ConnectionProvider.SqlServer,
+            Server = "localhost",
+            SqlServerPort = 1434,
+            Database = "TestDb",
+            UserId = "sa",
+            Password = "secret123"
+        };
+
+        // Act
+        var result = entry.GenerateConnectionString();
+
+        // Assert
+        result.ShouldContain("Server=localhost,1434");
+        result.ShouldContain("Database=TestDb");
+    }
+
+    [Fact]
+    public void GenerateConnectionString_SqlServer_WithoutPort_NoPortInServer()
+    {
+        // Arrange
+        var entry = new ConnectionStringEntry
+        {
+            Provider = ConnectionProvider.SqlServer,
+            Server = "localhost",
+            SqlServerPort = null,
+            Database = "TestDb",
+            UserId = "sa",
+            Password = "secret123"
+        };
+
+        // Act
+        var result = entry.GenerateConnectionString();
+
+        // Assert
+        result.ShouldContain("Server=localhost;");
+        result.ShouldNotContain("Server=localhost,");
+    }
+
+    [Fact]
+    public void GenerateConnectionString_SqlServer_WithZeroPort_NoPortInServer()
+    {
+        // Arrange
+        var entry = new ConnectionStringEntry
+        {
+            Provider = ConnectionProvider.SqlServer,
+            Server = "localhost",
+            SqlServerPort = 0,
+            Database = "TestDb",
+            UserId = "sa",
+            Password = "secret123"
+        };
+
+        // Act
+        var result = entry.GenerateConnectionString();
+
+        // Assert
+        result.ShouldContain("Server=localhost;");
+        result.ShouldNotContain("Server=localhost,");
+    }
 }