feat: allow users to add remote models

[louis-menlo]

Describe Your Changes

Allow users to manually add models when model list URL is unavailable/inaccessible (e.g. OpenRouter).

AC:

• User can manually add models for any remote
• Added models appear in the model list in respective remote engine settings
• Models can be configured and used normally
• Proper error handling if:
  • model ID already exists

User can add new remote model

Error handling - model already exists

Out of scope:

• model ID doesn't exists (/models settings don't work for all endpoints - KIV)

Fixes Issues

• Closes roadmap: Allow Users To Add Remote Models #4515

Changes

This pull request includes several changes to improve the management and addition of remote engine models. The key changes involve adding new functionalities for handling remote engine models, updating the UI components, and importing necessary modules.

Improvements to remote engine model management:

• core/src/types/model/modelEntity.ts: Added a new optional mode field to the Model type to represent a modern version of the model identifier.
• web/hooks/useEngineManagement.ts: Added addRemoteEngineModel and useGetEngineModelSources functions to handle adding remote engine models and fetching remote model sources.

UI updates and new components:

• web/screens/Settings/Engines/ModalAddModel.tsx: Introduced a new ModalAddModel component to provide a user interface for adding new remote engine models.
• web/screens/Settings/Engines/RemoteEngineSettings.tsx: Integrated the ModalAddModel component into the RemoteEngineSettings screen to allow users to add models directly from the settings.

Module imports:

• web/hooks/useEngineManagement.ts: Imported additional necessary modules (ModelSource, ModelSibling, Model, ModelEvent) to support the new functionalities.
• web/screens/Settings/Engines/RemoteEngineSettings.tsx: Imported the ModalAddModel component to be used in the settings screen.

[github-actions]

Barecheck - Code coverage report

Total: 67.88%

Your code coverage diff: -0.11% ▾

Uncovered files and lines

File	Lines
core/src/browser/extensions/enginesManagement.ts	19
web/hooks/useEngineManagement.ts	35-36, 38, 59, 72-73, 75, 85, 87, 94, 101-102, 104, 114, 116, 123, 132, 137, 139, 145, 147, 149-152, 156-157, 160-161, 164, 175, 188, 192, 194, 200, 202-204, 206, 210-211, 214-215, 218, 227, 238-239, 241, 249, 252-253, 261, 265, 277, 279-280, 283, 285-286, 288-289, 302, 304-305, 308, 310-312, 314-315, 327, 329-330, 333, 335-337, 339-340, 349, 351-352, 355, 357-359, 361-362, 374, 376-377, 380, 382-384, 386-387, 398, 400-401, 404, 406, 411-412, 414-415