New dev/eval seeder populates a small, broad dataset so a fresh site has
something on every screen: ~25 assets across machines, computers,
printers, network devices, and measuring tools, plus supporting
vendors/business-units/locations, six 3D-printed parts (two below their
low-stock threshold to exercise the alert), and a few relationships for
the map and relationship cards. Idempotent, keyed on a DEMO- assetnumber
prefix; skips the plugin sections that are not installed.
`flask seed demo-clear` removes exactly what it created: bulk-deletes the
DEMO- assets so the DB-level ON DELETE CASCADE drops each plugin subtype
row (per-object ORM delete would try to NULL the NOT NULL child assetid),
after clearing the demo relationships first. Leaves reference data,
settings, users, and any imported rows untouched.
Documented as an optional step in the dev setup guide.
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