Requires https://github.com/toeverything/AFFiNE/pull/13606 to be merged.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
- New Features
- Introduced an in-app Paywall with Pro, AI, and Believer plans, feature
previews, paging dots, and selectable pricing options.
- Added purchase and restore actions, plus a unified, polished UI using
new color/icon resources.
- Documentation
- Added Swift Code Style Guidelines.
- Chores
- Updated dependencies (including MarkdownView 3.4.2), added new
resource packages, and removed an unused dependency.
- Raised iOS deployment target to 16.5 and refreshed project settings.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Co-authored-by: DarkSky <25152247+darkskygit@users.noreply.github.com>
