Document EF Core AppHost migration management

[Copilot]

Adds the 13.3 docs page for Aspire.Hosting.EntityFrameworkCore and wires it into the EF Core docs set. This documents the AppHost-side EF migration model separately from the existing per-database EF Core client integration pages.

• New EF Core AppHost page

  • Added integrations/databases/efcore/efcore-host.mdx
  • Documents the AppHost-only role of Aspire.Hosting.EntityFrameworkCore
  • Covers:
    • AddEFMigrations usage
    • startup migration orchestration with RunDatabaseUpdateOnStart
    • ordering dependent apps with WaitForCompletion
    • migration resource configuration (WithMigrationsProject, output directory, namespace)
    • dashboard operations surfaced for EFMigrationResource

• TypeScript parity

  • Included both C# and TypeScript AppHost samples because the package surface exists in the repo’s exported TS metadata
  • Kept examples aligned with the actual exported API shape

• EF Core overview updates

  • Added a direct pointer from efcore/overview.mdx to the new AppHost page
  • Clarifies the distinction between:
    • EF Core client integrations in consuming apps
    • EF migration management modeled in the AppHost

• Navigation and localization

  • Added the new page to the EF Core sidebar section
  • Added the ja mirror page with English placeholder content to match the repo’s localization flow

Example AppHost usage:

var api = builder.AddProject<Projects.Api>("api")
    .WithReference(db);

var migrations = api.AddEFMigrations("api-migrations", "MyApp.Data.AppDbContext")
    .RunDatabaseUpdateOnStart();

api.WaitForCompletion(migrations);

[AndriySvyryd]

I don't think it makes sense to document this in one way here and in another in https://github.com/microsoft/aspire.dev/blob/main/src/frontend/src/content/docs/integrations/databases/efcore/migrations.mdx#automated-ef-migrations-with-addefmigrations

[AndriySvyryd]

Also mention that the connection string shouldn't be configured during publish, see microsoft/aspire#17847 (comment)

[AndriySvyryd]

@IEvangelist I can review this once you decide on the general structure for these docs

[Copilot]

Pull request overview

This PR adds a new EF Core documentation page focused on AppHost-side EF Core migration management via Aspire.Hosting.EntityFrameworkCore, and connects it into the EF Core docs and sidebar navigation. It also introduces a Japanese locale mirror page (currently English placeholder content) consistent with the repo’s localization workflow.

Changes:

• Added a new efcore-host page documenting AppHost modeling of EF migrations, including dashboard operations and startup/publish workflows (C# + TypeScript samples).
• Updated the EF Core overview to link to the new AppHost migration-management page and clarify AppHost vs consuming-app responsibilities.
• Wired the new page into the Integrations sidebar EF Core section; added a ja mirror page.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/frontend/src/content/docs/ja/integrations/databases/efcore/efcore-host.mdx	Adds the Japanese-locale mirror page (English placeholder) for the new EF Core AppHost migration management doc.
src/frontend/src/content/docs/integrations/databases/efcore/overview.mdx	Adds a pointer to the new AppHost migration-management page and improves formatting/clarity.
src/frontend/src/content/docs/integrations/databases/efcore/efcore-host.mdx	Adds the new EF Core AppHost migration management documentation page (C# + TypeScript).
src/frontend/config/sidebar/integrations.topics.ts	Adds the new EF Core AppHost page to the EF Core sidebar navigation.

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