SSH Proxy 0.1.5.1

fix: Improve setup scripts reliability and simplify proxy configuration

- Fix bash variable substitution errors in instruction scripts
- Auto-detect SSH service name (ssh vs sshd) across different OS distributions
- Separate PKG_UPDATE and PKG_INSTALL commands to fix apt-get syntax errors
- Remove Privoxy option, standardize on Tinyproxy only for simplicity
- Add proper error handling and service detection feedback

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Co-Authored-By: Claude <noreply@anthropic.com>