feat(seed): replace the size tiers with the four Ley 187-17 categories

[mrivas00]

Why

MMARN observed that the organization-size catalog does not match Dominican law. The demo dataset ships eight tiers invented for the sample country ("Corporación multinacional (5000+ empleados)"); Ley 187-17 defines four.

PR 4 of 8 · base feat/mati/rd-schema-additions (PR 3) · no migration.

What

Before (8 demo tiers)	After (Ley 187-17)
Microempresa (1-10 empleados)	Microempresa (hasta 10 trabajadores)
Pequeña empresa (11-49 empleados)	Pequeña empresa (11 a 50 trabajadores)
Mediana empresa I / II (50-99, 100-249)	Mediana empresa (51 a 150 trabajadores)
Gran empresa, Empresa muy grande, Corporación grande, Corporación multinacional	Empresa grande

position is assigned by the seed in file order, so the maintainer and the form present them smallest-first.

Review notes

The size tier is independent of employeesCount: nothing derives one from the other, and neither field is required on the form. An organization can therefore declare its Ley 187-17 category without disclosing an exact headcount — which is the point, since the law's categories also depend on gross annual sales, a figure the platform does not collect.

The maintainer's explanation text is already generic about thresholds ("Cada Tamaño suele definir tramos en función de número de empleados, ingresos u otros criterios establecidos por el regulador"), so it stays accurate unchanged.

Verification

pnpm format && pnpm lint && pnpm type-check green.

Not verified here: task 5.3 asks to reseed and confirm the form offers exactly four tiers — no database was available in the authoring environment. Note that this replacement is one of the reasons the deployment needs the reset window (seed.ts skips entirely when country.count() > 0), so it should be exercised there.