[OU-ADD] iap: backfill service_id from legacy service_name

[dnplkndll]

What this scope covers

Adds openupgrade_scripts/scripts/iap/19.0.1.1/post-migration.py to backfill iap_account.service_id from the preserved legacy service_name column for rows that an earlier major-version migration left in a half-migrated state.

Why

Surfaced in lab make migrate against our prod-seed via:

WARNING odoo.schema: Missing not-null constraint on iap.account.service_id

The 18.0 and 19.0 ORM definitions of iap.account are actually identical (service_id = Many2one(required=True), service_name = Char(related=...)). The mismatch comes from earlier — the openupgrade_legacy_18_0_service_name column on our seed shows the rename happened in 17→18 — and one stale row from 2020 never received a service_id value. 19.0's _auto_init then tries to add NOT NULL and warns when the orphan blocks it.

Any DB carrying that same shape (legacy_service_name preserved, service_id NULL) hits the same warning. The backfill defensively maps both.

What's in the patch

• openupgrade_scripts/scripts/iap/19.0.1.1/post-migration.py — a single UPDATE … FROM iap_service statement that joins on technical_name via openupgrade.get_legacy_name("service_name").
• docsource/modules180-190.rst — sets the iap row to Done so the test workflow picks it up.

No upgrade_analysis_work.txt (precedent: barcodes_gs1_nomenclature/19.0.1.0, digest/19.0.1.1, pos_discount/19.0.1.0 all ship post-migration.py without a work file when the analysis bot didn't generate a delta).

Reproducing

The analysis bot doesn't flag this — the gap is invisible at the ORM-definition level and only surfaces when a real seed carries orphan rows. To reproduce the warning before the patch:

docker compose exec -T db psql -U odoo -d <seed> -c "
  SELECT COUNT(*) FILTER (WHERE service_id IS NULL) AS null_rows,
         COUNT(*) AS total
    FROM iap_account
   WHERE openupgrade_legacy_18_0_service_name IS NOT NULL;"

A null_rows > 0 count indicates the same shape as our seed.

How to verify

After this branch lands in repos.yaml and make sync-repos:

make seed-prod && make migrate
# Expect: no "Missing not-null constraint on iap.account.service_id" in
# /tmp/migrate-iter.log; "Modules loaded." + "Registry loaded in <N>s."
# at the tail.

docker compose exec -T db psql -U odoo -d ou_iter -c \
  "SELECT COUNT(*) FILTER (WHERE service_id IS NULL) FROM iap_account;"
# Expect: 0