* docs: add GitHub proxy config design spec * docs: add GitHub proxy config implementation plan * feat(backend): use configurable github proxy for node upgrades * feat(backend): use configurable github proxy for node install command * feat(frontend): add github proxy config settings * feat(script): support configurable github proxy in installer flows Honor custom GitHub mirror settings across interactive and env-driven installer/update paths so script downloads match the panel configuration. Add shell regressions to lock down proxy prompting, URL recomputation, and non-interactive fallback behavior.
* docs: add floating save button design spec for issue #266 * docs: add implementation plan for floating save button * feat(config): add floating save button (FAB) for issue #266
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