Update Nitro integration for HotChocolate and Fusion

[PascalSenn]

• Added ChilliCream.Nitro.HotChocolate package to documentation and examples.
• Updated migration guides to reflect package restructuring from 1.x to 16.x.
• Introduced AddDefaults() method via Roslyn source generator for simplified Nitro integration.
• Changed configuration methods for Nitro in HotChocolate and Fusion, replacing AddNitro() with ModifyNitroOptions().
• Consolidated Azure packages into a single ChilliCream.Nitro.Azure package.
• Updated OpenTelemetry integration to use AddOpenTelemetry() instead of AddNitroExporter().
• Revised examples and documentation to reflect new configuration patterns and best practices.

[Copilot]

Pull request overview

This PR updates the documentation set to reflect Nitro v16’s package restructuring and new configuration patterns across HotChocolate, Fusion, Mocha, and OpenTelemetry integrations.

Changes:

• Updates Nitro/OpenTelemetry docs and examples to use ChilliCream.Nitro + platform integration packages and the new AddNitro(...).AddOpenTelemetry() flow.
• Adds new Nitro docs for the source-generator-based AddDefaults() experience (Analyzers page) and a comprehensive migration guide from 1.x to 16.x.
• Updates HotChocolate/Fusion v16 migration/guides to reference the new Nitro migration path and defaults-based integration.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
website/src/docs/nitro/open-telemetry/service-monitoring.md	Updates service monitoring setup to the new Nitro + OpenTelemetry packages and registration flow.
website/src/docs/nitro/open-telemetry/operation-monitoring.md	Updates GraphQL operation monitoring setup to the new Nitro/OpenTelemetry registration approach.
website/src/docs/nitro/open-telemetry/logging.md	Updates logging setup to use AddNitro(...).AddOpenTelemetry() instead of per-provider Nitro exporter wiring.
website/src/docs/nitro/nitro-services.md	Updates “Connect your API” example to the new package split and service registration style.
website/src/docs/nitro/migration/migrate-from-1-to-16.md	Adds a Nitro 1.x → 16.x migration guide covering package renames, API changes, and examples.
website/src/docs/nitro/apis/operation-reporting.md	Updates operation reporting setup to use AddDefaults() and new package IDs.
website/src/docs/nitro/apis/fusion.md	Updates Fusion docs for v16 Nitro integration (AddNitro + AddDefaults, OpenTelemetry, cache config).
website/src/docs/nitro/analyzers.md	Adds documentation for analyzers/source generator warnings and generated AddDefaults().
website/src/docs/mocha/v16/observability.md	Updates Mocha Nitro/OpenTelemetry guidance to use the new AddOpenTelemetry() integration.
website/src/docs/hotchocolate/v16/migrating/migrate-from-15-to-16.md	Replaces inline Nitro migration details with a link + key changes summary aligned to v16 restructuring.
website/src/docs/hotchocolate/v16/guides/private-api.md	Updates first-party API guide to register Nitro via builder.Services.AddNitro() (examples adjusted).
website/src/docs/fusion/v16/migration/migrate-from-15-to-16.md	Replaces inline Nitro migration details with a link + key changes summary aligned to v16 restructuring.
website/src/docs/fusion/v16/guides/first-party-api.md	Updates the Fusion first-party API guide to use AddNitro().AddDefaults() + adds generator note.
website/src/docs/fusion/v16/deployment-and-ci-cd.md	Updates runtime wiring from AddFusion() to AddDefaults() + adds generator note.
website/src/docs/docs.json	Adds navigation entries for Nitro “Analyzers” and “Migration”.

Comments suppressed due to low confidence (1)

website/src/docs/nitro/open-telemetry/service-monitoring.md:50

• Step 3 re-lists OpenTelemetry.Extensions.Hosting even though it’s already included in the required packages list above (and the earlier command pins versions while this one doesn’t). Consider removing the duplicate install line (or keep a single, consistent install block) to avoid confusing readers.

```shell
dotnet add package OpenTelemetry.Extensions.Hosting
dotnet add package OpenTelemetry.Instrumentation.AspNetCore

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