Report missing objects to server when not found in online index

[Copilot]

When downloading missing objects for a scenario, the editor now reports objects not found in the online index to the server's missing objects registry.

Changes

Client layer (Definitions/Web/Client.cs)

• Added AddMissingObjectAsync to POST DtoMissingObjectEntry to /missing endpoint

GUI client wrapper (Gui/ObjectServiceClient.cs)

• Exposed AddMissingObjectAsync method

Scenario view model (Gui/ViewModels/LocoTypes/SCV5ViewModel.cs)

• Modified DownloadMissingObjects() to report objects not found in online index:

if (onlineObj == null)
{
    var missingEntry = new DtoMissingObjectEntry(
        obj.Name, obj.Checksum, obj.ObjectType.Convert());
    
    var added = await Model.ObjectServiceClient.AddMissingObjectAsync(missingEntry);
    // Log result and continue
}

Tests (Tests/ObjectServiceIntegrationTests/ObjectRoutesTest.cs)

• Added integration test verifying missing objects are created in database with ObjectAvailability.Missing status

The server-side /missing endpoint (AddMissingObject in ObjectRouteHandler.cs) was already implemented.

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Allow editor to add to missing objects</issue_title>
<issue_description>This would happen if the user of the editor runs the 'find objects in service for scenario' and the server indicates some are missing. The editor can then request that those are missing and to add them</issue_description>

<agent_instructions>The ObjectService project is where the web server is. It already has a route /missing for checking missing objects (ListMissing) and adding addition ones to the database (AddMissing), as well as the DtoMissingObjectEntry record. What needs to happen is in the editor (Gui project), specifically in the DownloadMissingObjects() method, if there is no matching object found in the online index, then we send a post request to the server with the details about the missing object via a new DtoMissingObjectEntry</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Allow editor to add to missing objects #194

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[Copilot]

Pull request overview

This PR adds functionality for the ObjectEditor to report objects that are not found in the online index to the server's missing objects registry. When users attempt to download missing objects for a scenario and the server indicates some are not available, the editor now automatically reports these to the server for tracking purposes.

Key Changes

• Implemented client-side method to POST missing object entries to the server
• Enhanced scenario download workflow to report unfound objects
• Added integration test to verify missing objects are properly recorded in the database

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
Definitions/Web/Client.cs	Added AddMissingObjectAsync method to POST missing object entries to the /missing endpoint
Gui/ObjectServiceClient.cs	Exposed the AddMissingObjectAsync method for GUI layer consumption
Gui/ViewModels/LocoTypes/SCV5ViewModel.cs	Modified DownloadMissingObjects to report objects not found in online index and improved error logging with contextual information
Tests/ObjectServiceIntegrationTests/ObjectRoutesTest.cs	Added integration test AddMissingObjectAsync that verifies missing objects are created with correct availability status
Tests/ObjectServiceIntegrationTests/BaseReferenceDataTableTestFixture.cs	Refactored GetDbContext helper method to reduce code duplication in test setup