Introduces the `administrators` relational table and repository layer
for the v3 backend, unifying instance, organization, project, and
project-grant membership into a single scoped model.
Closes#10220
## Changes
- **Domain**: `Administrator` struct, `AdministratorScope` enum,
`AdministratorRepository` interface with typed CRUD, column, condition,
and change helpers. Generated enumer and GoMock.
- **Migration** (`016`): `zitadel.administrators` table with a generated
`id`, scope-alignment check constraint, cascading foreign keys, and a
child `administrator_roles` table.
- **Repository**: CTE-based role mutations (`AddRole`, `RemoveRole`,
`SetRoles`) for atomicity. Roles aggregated via `ARRAY_AGG`.
- **Projection**: Event reducers for
`member.added/changed/removed/cascade_removed` across all four admin
scopes.
- **Fixes**: `Rows.Close()` error wrapping; `TextArray` nil-safe scan +
full `pgtype` array interface; `authorization` and `projectGrant` scan
helpers fixed for `ARRAY_AGG` under `database/sql`; removed unused `ctx`
parameter from `callReduce`.
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Co-authored-by: Marco Ardizzone <[email protected]>
## Problem description
During tests we found concurrency issues in the relational table
projections. Tests got flaky if a table (e.g. organization domains) had
too many foreign keys to tables which were projected by another handler.
## Resolution
The projections of the relational tables got merged into one handler to
enforce sequential reduction of events.
## Additional info
- closes https://github.com/zitadel/zitadel/issues/11703
- closes https://github.com/zitadel/zitadel/issues/10810
---------
Co-authored-by: Marco Ardizzone <[email protected]>
# Which Problems Are Solved
Add integration tests for recovery codes event reducers in the RT model.
# How the Problems Are Solved
Added integration tests for recovery codes event reducers
# Additional Changes
N/A
# Additional Context
- Closes https://github.com/zitadel/zitadel/issues/11707
- Todo: add tests for other reducers in the `users_relational`
projection.
---------
Co-authored-by: Livio Spring <[email protected]>
