Move Microsoft Foundry docs out of the Azure section into Artificial Intelligence, and rename away from "Azure AI Foundry" #1884

Problem

The Foundry integration docs currently live under Integrations > Cloud > Azure (src/frontend/src/content/docs/integrations/cloud/azure/azure-ai-foundry/), alongside the folder/package name azure-ai-foundry and page titles referencing "Azure AI Foundry".

Microsoft Foundry is no longer Azure-branded, so placing it under the Azure section is confusing to readers browsing the integrations nav (raised with a screenshot in team chat). The hosting package itself was already renamed from Aspire.Hosting.Azure.AIFoundry to `Aspire.Hosting.Foundry" (see #515), but the docs location/naming was never updated to match.

Proposed change

• Move the Foundry docs from integrations/cloud/azure/azure-ai-foundry/ to the Artificial Intelligence section (integrations/ai/foundry/), alongside the existing openai, ollama, and github-models integrations.
• Rename references from "Azure AI Foundry" to just "Foundry" in page titles, nav labels, and the folder/file names, to match the current (non-Azure-branded) product name and package name (Aspire.Hosting.Foundry).
• Update src/frontend/src/data/integration-docs.json (and any other data files / redirects) that point at the old /integrations/cloud/azure/azure-ai-foundry/... paths so links keep working.

Context

Flagged by Maddy Montaquila in the Aspire content team chat: "this is confusing that its under azure ai" / "we need to move Microsoft foundry entirely to the artificial intelligence section" / "looks like the docs are wrong too cause the integration name should just be foundry".