* Introduce NetworkType enum to improve network type handling
Created a `NetworkType` enum to represent various network types, improving readability and reducing potential errors caused by hardcoded string comparisons. Updated the `getQueryDic` function to utilize this enum.
* Refactor to use NetworkType enum in VmessFmt
Replaced hardcoded network type strings with the `NetworkType` enum in `VmessFmt` functions. Updated `parse`, `toUri`, and `parseVmessStd` methods to use `NetworkType.fromString`, improving readability and reducing errors caused by typos in network type strings.
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