Document existing-solution Low-Code integration

[salihozkara]

Summary

• target the existing-solution Low-Code workflow at ABP 10.6.x and .NET 10 while keeping all ABP and Low-Code packages on the same patch line
• document how to add Low-Code to an existing EF Core solution through ABP Studio
• describe Admin Console, companion React runtime, and MVC/Angular/Blazor navigation integration
• add Studio screenshots and publish both existing-solution integration guides in the Low-Code index and documentation navigation
• add companion seed baseline checks, Testing Library peer-dependency guidance, application renaming/localization, and /lowcode test updates

Validation

• applied the guide end to end to a fresh layered MVC application
• verified EF migration and DbMigrator behavior, .NET build/tests, React production build, and model-file validation
• verified anonymous and authorized menus, Designer mutations, runtime CRUD, antiforgery, exact OIDC deep-link return, Admin Console filtering, omitted-route 404 behavior, and scoped fallback in a browser
• checked Markdown fences, conditional blocks, relative links, whitespace, and active package-install examples

Notes

• version-specific ABP 10.5 observations are retained only as historical regression checkpoints; current installation examples target 10.6.x
• non-react-ui-integration.md is published as the MVC, Razor Pages, Angular, and Blazor companion-runtime guide

[Copilot]

Pull request overview

This PR expands the ABP Low-Code documentation to cover retrofitting Low-Code into an existing EF Core solution (targeting ABP 10.6.x / .NET 10), including guidance for hosting the React-based Designer/runtime alongside non-React UIs (MVC/Razor Pages/Angular/Blazor), and wires the new guides into the Low-Code doc navigation.

Changes:

• Added a new end-to-end guide for adding Low-Code to an existing EF Core solution via ABP Studio plus required manual wiring (add-to-existing-solution.md).
• Added a comprehensive companion-runtime + navigation integration guide for non-React UIs (non-react-ui-integration.md).
• Updated the Low-Code index and global docs navigation to link and surface the new guides.

Reviewed changes

Copilot reviewed 4 out of 8 changed files in this pull request and generated 3 comments.

File	Description
docs/en/low-code/non-react-ui-integration.md	New non-React UI integration guide for Admin Console + companion React runtime + navigation patterns.
docs/en/low-code/index.md	Adds cross-links to the new “existing solution” and “non-React UI” guides.
docs/en/low-code/add-to-existing-solution.md	New guide documenting ABP Studio import + manual backend/runtime wiring for existing EF Core solutions.
docs/en/docs-nav.json	Publishes the new Low-Code documentation entries in the docs navigation tree.

[github-actions]

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