chore: bump version to 2.1.1 in package.json, package-lock.json, and server.json

[SavioBS629]

Bumps version 2.1.0 → 2.1.1 in package.json, package-lock.json, and server.json ahead of release.

Patch bump off current main (2.1.0). Note #460 proposes 2.2.0 from the same base — only one of the two should land.

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