feat: add support for the original AuthMeVelocity jar as well

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The issue title mentions adding support for the original AuthMeVelocity jar. Research the existing plugin structure in the repository, likely in src/main/java, to understand how server tracking is implemented. Compare with the original AuthMeVelocity project to identify integration points. Determine what 'support' entails: configuration changes, dependency handling, or compatibility layers. Testing would involve building the plugin and verifying it works with both jar versions.

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