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Configure rate limits on VirtualMCPServer PR B 2 (#5522)

This PR adds optimizer-aware vMCP rate limiting using the post-refactor core.VMCP decorator seam.

PR #5276 wired VirtualMCPServer.spec.config.rateLimiting into the vMCP runtime. After the vMCP core refactor, optimizer mode resolves the call_tool meta-tool to the real backend tool before invoking core.VMCP.CallTool. That means rate limiting no longer needs HTTP parsed-request rewriting. It can sit below the optimizer at the core CallTool seam and key buckets directly by the resolved backend tool name.

Follow-up to #5276 and aligned with the vMCP core refactor in #5606 .

Fixes #4552

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