Update AI Chat Web template to Aspire 13.0.0

[Copilot]

Aspire 13.0.0 was recently published. This updates the AI Chat Web template to reference the new version.

Changes

• GeneratedContent.targets: Updated Aspire package versions from 9.5.1 to 13.0.0
• ServiceDiscovery: Updated to 10.0.0 (latest available; 13.0.0 does not exist on NuGet)
• Template snapshots: Regenerated 9 .csproj files across 3 Aspire template variants (BasicAspire, AzureOpenAI_Qdrant_Aspire, Ollama_Qdrant)

All snapshot tests pass with the updated versions.

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Update AI Chat Web template to use Aspire 13</issue_title>
<issue_description>Aspire 13.0.0 was just published. We should update the AI Chat Web template to utilize it. This will primarily involve updating the Aspire versions in GeneratedContent.targets and updating template snapshots.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Update AI Chat Web template to use Aspire 13 #7035

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Microsoft Reviewers: Open in CodeFlow

[MackinnonBuck]

Getting this failure in the template execution tests:

Detected package downgrade: Microsoft.Extensions.AI from 10.0.0 to 10.0.0-ci. Reference the package directly from the project to select a different version.

This is happening because Aspire.Azure.AI.OpenAI references Microsoft.Extensions.AI version 10.0.0, but the locally-built version of Microsoft.Extensions.AI is 10.0.0-dev, which is seen as lower.

@jeffhandley is it OK to make branding changes in this PR (incrementing the minor version)? That would solve this issue, but I know that we usually the change minor version in dedicated "branding update" PRs.