feat(design): add header logo upload and showCommunityName (#131)
* 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
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