mcp: set HasPrompts to false since no prompts are registered

[Elvand-Lie]

The MCP server declares HasPrompts: true in its capabilities but no prompts are registered. Per the MCP specification, clients may call prompts/list when this capability is advertised and expect results.

Set HasPrompts to false to accurately reflect the server capabilities.

Changes

• Set HasPrompts to false in MCP server options since no prompts are registered

/kind bug

Fixes #3689

Release Note

NONE

[knative-prow]

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[knative-prow]

Hi @Elvand-Lie. Thanks for your PR.

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