implement full cli flags and readme#4

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UltimateForm merged 4 commits intomasterfrom

Jan 19, 2026

Commits on Jan 18, 2026

feat: implement secure password input using golang.org/x/term
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feat: Add CLI option to execute a single RCON command and improve authentication error propagation.
UltimateForm
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Commits on Jan 19, 2026

refactor: rename `client` package to `rcon`, `common` to `common_rcon`, and update README with library usage examples including streaming responses.
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feat: add TCPRCON prefix to all global log messages
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