docs: add public privacy policy page for GitHub Pages

[arkariz]

Summary

• Adds docs/privacy-policy.html, a standalone public privacy policy page for Bonked, intended to be served via GitHub Pages (Settings → Pages → Deploy from branch → main /docs) and used as the privacy policy URL in the Play Console listing.
• Content is derived directly from the actual data flows in the codebase, not boilerplate:
  • On-device-only watched-app usage tracking (UsageStatsManager)
  • The complete AnalyticsCore.allowlistedFieldsByEvent field allowlist, so the "no free-text/PII" claim is independently checkable against the source
  • The fixed mood-string sent to GIPHY's search API (the only data actually shared with a third party for the reaction-GIF feature)
  • PostHog analytics, explicitly marked as "if enabled" since a blank POSTHOG_API_KEY is a fully supported no-op build state
  • The anonymous GitHub Releases roast-pack sync check, noted as sending no user data
  • The full permission list from AndroidManifest.xml with plain-language justification for each

Test plan

• Merge to main
• Enable GitHub Pages (Settings → Pages, source: main branch, /docs folder) — requires the repo to be public
• Confirm the page renders at https://arkariz.github.io/memeapp/privacy-policy.html in both light and dark mode
• Paste that URL into the Play Console privacy policy field

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🤖 Generated with Claude Code

https://claude.ai/code/session_01APiUERJLZddCPpd8gJ94R4

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Generated by Claude Code