Enhance node update functionality to include base address

- Added `BaseAddress` property to `UpdateNodeCommand` and `UpdateNodeBody` for improved node management.
- Implemented validation for the base address in `UpdateNodeCommandHandler`, ensuring it is a valid absolute URI.
- Updated `Node` class to support address updates, including logic to invalidate cached clients on address changes.
- Enhanced frontend components to handle base address input in the node editing dialog and API requests.
- Updated validation rules to enforce base address requirements in `UpdateNodeCommandValidator`.

backend/src/PnvPanel.Api/Endpoints/NodeEndpoints.cs

@@ -52,6 +52,7 @@ public static class NodeEndpoints
         var command = new UpdateNodeCommand(
             id,
             body.Name,
+            body.BaseAddress,
             body.Location,
             body.IsEnabled,
             body.Username,
@@ -94,6 +95,7 @@ public static class NodeEndpoints
 
 public sealed record UpdateNodeBody(
     string Name,
+    string BaseAddress,
     string? Location,
     bool IsEnabled,
     string? Username,