Add TypeScript AppHost support to Fusion Aspire

[michaelstaib]

No description provided.

[Copilot]

Pull request overview

This PR updates Fusion Aspire to better support polyglot (.NET + TypeScript) Aspire AppHosts by exporting the relevant extension methods for SDK generation, renaming the main composition entry points to “Nitro” terminology, and restructuring the Fusion documentation around a new “Local Development” guide (including redirects and migration guidance).

Changes:

• Introduces AddNitroComposition / WithNitroComposition (with exported APIs) and updates tests to match.
• Adds language-tab MDX components to present C# and TypeScript AppHost examples side-by-side.
• Replaces the old “Aspire Integration” doc with a new “Local Development” doc, updates references, and adds redirects + a 16.5→16.6 migration guide.

Reviewed changes

Copilot reviewed 23 out of 24 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
website/src/components/LanguageTabs.tsx	New MDX helper to render C#/TypeScript content in tabs.
website/mdx-components.tsx	Registers LanguageTabs, CSharp, and TypeScript for MDX rendering.
website/nginx/conf.d/redirects.conf	Redirects old Fusion Aspire doc routes to local-development.
website/content/docs/fusion/structure.yaml	Replaces “Aspire Integration” nav entry with “Local Development”.
website/content/docs/fusion/migration/structure.yaml	Adds migration entry for v16.5 → v16.6.
website/content/docs/fusion/migration/migrate-from-16-5-to-16-6.md	New migration guide documenting API renames and behavioral changes.
website/content/docs/fusion/local-development.md	New primary doc for Aspire-based local development (C# + TypeScript).
website/content/docs/fusion/connectors/apollofederation.md	Updates references/snippets to WithNitroComposition and new doc link.
website/content/docs/fusion/composition.md	Updates links from removed Aspire page to local-development.
website/content/docs/fusion/cli.md	Updates link target from aspire-integration to local-development.
website/content/docs/fusion/aspire-integration.md	Removes deprecated Aspire Integration page.
website/content/blog/2026-05-15-fusion-16.md	Updates blog link to the new Local Development guide.
src/HotChocolate/Fusion/src/Fusion.Aspire/NitroExtensions.cs	Adds exported AddNitroComposition and tightens WithNitroApiId constraints.
src/HotChocolate/Fusion/src/Fusion.Aspire/GraphQLResourceBuilderExtensions.cs	Adds exported WithNitroComposition + obsoletes old naming.
src/HotChocolate/Fusion/src/Fusion.Aspire/GraphQLOrchestratorExtensions.cs	Updates obsolete alias to point to AddNitroComposition.
src/HotChocolate/Fusion/src/Fusion.Aspire/SchemaComposition.cs	Updates Nitro diagnostic messaging for new API name.
src/HotChocolate/Fusion/src/Fusion.Aspire/Nitro/NitroSeedUpdateOptions.cs	Makes seed update options DTO-friendly ([AspireDto], init-only props).
src/HotChocolate/Fusion/src/Fusion.Aspire/Nitro/NitroCompositionOptions.cs	Allows replacing SeedUpdates (needed for options-object style APIs).
src/HotChocolate/Fusion/src/Fusion.Aspire/HotChocolate.Fusion.Aspire.csproj	Enables Aspire analyzers and tags package for polyglot support.
src/HotChocolate/Fusion/test/Fusion.Aspire.Tests/SchemaCompositionTests.cs	Renames tests and call sites to WithNitroComposition.
src/HotChocolate/Fusion/test/Fusion.Aspire.Tests/NitroExtensionsTests.cs	Updates tests for AddNitroComposition behavior and new argument validation.
src/HotChocolate/Fusion/test/Fusion.Aspire.Tests/Nitro/NitroSchemaCompositionTests.cs	Updates snapshot expectations for new diagnostics text.
src/HotChocolate/Fusion/test/Fusion.Aspire.Tests/CompositionHarness.cs	Updates harness to use init-only NitroSeedUpdateOptions.

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Patch coverage

97.6% of changed lines covered (41/42)

File	Covered	Changed	Patch %
…/Fusion/src/Fusion.Aspire/GraphQLResourceBuilderExtensions.cs	1	2	50.0% 🔴
…/Fusion/src/Fusion.Aspire/GraphQLOrchestratorExtensions.cs	1	1	100.0% 🟢
…/Fusion/src/Fusion.Aspire/Nitro/NitroCompositionOptions.cs	1	1	100.0% 🟢
…/Fusion/src/Fusion.Aspire/Nitro/NitroSeedUpdateOptions.cs	2	2	100.0% 🟢
src/HotChocolate/Fusion/src/Fusion.Aspire/NitroExtensions.cs	34	34	100.0% 🟢
…/HotChocolate/Fusion/src/Fusion.Aspire/SchemaComposition.cs	2	2	100.0% 🟢

Uncovered changed lines (JSON)

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Project coverage: 54.4% (242338/445619 lines)

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✅ michaelstaib
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