Stable checkpoint — Orders foundation page + Product API + common SHA aligned

Includes :
- Orders foundation page (list + create empty + delete) at /orders route
- Product API + interface (ed3472a, c95b04d already in v1.1.2)
- Order API + interface (ed3472a — already in v1.1.2, page consumes it)
- Common submodule bumped to 3e7acba (bump-common-everywhere.sh + ADR-0055)

Mirrors backend Order/Product foundation. Follow-up MRs : OrderLine inline,
status transitions UI, customer-scoped filter, detail/edit screens.

Post-merge main pipeline #2480595786 green at 16:16.