fix(server): skip mdns probe listener

[adityachaudhary99]

Closes #35499

Summary

• disable bonjour-service probing for the opencode mDNS advertisement
• keep the existing publish/unpublish lifecycle intact
• assert the publish call opts out of probing in the mDNS server test

Verification

• git diff --check
• bun test test/server/httpapi-mdns.test.ts --timeout 60000 (blocked locally: Bun isolated install cannot resolve @modelcontextprotocol/sdk/client/index.js from the worktree)
• bun typecheck (blocked locally by pre-existing src/tool/registry.ts type errors)
• pre-push bun turbo typecheck (blocked locally by Windows resource exhaustion in tsgo / console-support)

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