The raw DELETE on Service Subscription was blowing up with
LinkExistsError because Service Contract.service_subscription still
referenced the sub. Worse: silently unlinking a live contract would
cost the business the break fee (résidentiel = avantages résiduels,
commercial = mensualités restantes).
Now when the user clicks 🗑 on a sub:
1. loadServiceContracts pulls `service_subscription` so the client
can spot the link without a round-trip.
2. If a non-terminal contract is linked, the dialog upgrades to:
• header: Contract name + type
• term bar: start → end, months elapsed / months remaining
(pulled live from /contract/calculate-termination)
• penalty breakdown box: total fee, split into benefits to
refund + remaining months, plus a warning that a termination
invoice will be created
• radio: "Désactiver seulement (conserver le contrat)" vs
"Résilier + facturer X$ + supprimer"
Suspend-only route goes through toggleSubStatus (no fee).
Terminate route hits /contract/terminate (status→Résilié +
invoice), then unlinks + deletes the sub, and drops an audit
line referencing the generated invoice.
3. If the linked contract is already Résilié/Complété we just scrub
the stale link inline in the plain confirm path so the
dispatcher isn't forced into the termination UI.
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