Seed all posts as admin + add a full-bleed splash page

#56 in Riparion/riparion-cms — merged 2026-06-03

Summary

• Attribute every seeded post to the admin account — both the help-doc tour posts and the Rust MDX demos — replacing the per-author round-robin. The ada/linus demo authors are still seeded (profiles, avatars, JSON-LD) and remain the round-robin pool for comment attribution variety.
• Seed one published, full-bleed page at /splash (ScreenLayout::FullBleed, single main region) whose body is a bare [[/splash cta="Continue" href="/blog" animate="rise"]] embed.
  • Omitting title/subtitle makes the hero fall back to the site's configured title/tagline, so it tracks header branding live.
  • The page is admin-owned via an arium_resource_members 'page' row, mirroring the real page-create path so per-page edit checks resolve.

Notes

• Seeding only runs on an empty blog (run_if_empty gates on posts > 0), so existing databases are unaffected.

Verification

• cargo fmt --all -- --check
• cargo clippy --no-default-features --features server,{sqlite,postgres} --all-targets -- -D warnings (both backends)
• cargo clippy --no-default-features --features web --target wasm32-unknown-unknown -- -D warnings -A dead_code

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