feat(extras): add silent-send module + new extras category
Adds services/silent-send.sh — installs the Silent Send browser extension (client-side PII redaction for AI chat). Non-docker module: installs git + Node.js >=18 (NodeSource) + npm, clones outis1one/silent-send to ~/silent-send, runs npm install (readies web-ext for Firefox build/sign), optionally builds a signed Firefox .xpi, and prints per-browser load/build instructions. README written to the checkout. Introduces a new 'extras' category for non-docker add-ons pulled from other repos, wired into setup.sh CATEGORY_ORDER (gaming -> extras -> backup) with an is_installed marker. MODULAR.md groups list updated. Bumps version to 0.9.9.
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Claude