docs: add Alpic Playground to supported clients

[qchuchu]

Adds the Alpic Playground, a full MCP client that renders MCP Apps inline, to the supported clients list.

We try to be 100% support of the spec of MCP Apps (cf the host conformance test : https://alpic-ai.github.io/mcp-app-conformance/), even elements of the draft spec.

[qchuchu]

@idosal @liady Would it be possible to merge this one ? :)

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@modelcontextprotocol/ext-apps

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commit: 4bde957