scaffold: db seed is a placebo — SELECT 1 plus a success banner, no rows seeded

[rickylabs]

Found during the #1250 composed verification (live scaffold at PR #1256's head). The scaffolded database/postgres/scripts/seed.ts is:

await client.$queryRaw`SELECT 1`;
console.log('✅ Database seed completed.');

netscript db seed therefore reports success while seeding nothing — the same silently-inert class as #1250's coercion plugin. Any docs/tutorial step that says 'seed then browse data' produces an empty table with a green checkmark, and GET-by-id docs-page requests hit missing rows (which currently 500 — filed separately).

Acceptance

• The scaffolded seed script seeds at least one representative row per generated model (or explicitly prints that the schema has nothing to seed — never a bare success banner over a no-op)
• A test fails if the seed script stops writing rows for a schema that has models
• Tutorial/docs seed steps verified against the new behavior

[rickylabs]

Milestone rollover (owner-directed, 2026-08-06): moved from the former mixed milestone 24, now renamed 0.0.7 for the Frontend Contribution Layer, into the newly created 0.0.6. This open item is not #922 or an epic:frontend-contrib child, so it belongs in the immediate post-0.0.5 follow-up release. Closed historical assignments were not changed.