* feat(design): add header logo upload and showCommunityName setting Add header logo upload endpoint (POST /api/admin/design/header-logo) with fit-inside resize to 600x120 and two new community_settings columns: header_logo_url and show_community_name. Update settings serialization, public endpoint, PUT handler, and Zod validation schemas. * fix(design): regenerate migration with drizzle-kit for proper snapshot The manually written migration lacked a drizzle-kit snapshot file, causing the CI Schema Drift Check to fail. Regenerated using `pnpm db:generate` which produces both the SQL and snapshot. * fix(design): resolve rebase conflicts and renumber migration to 0006