* fix(proxy): accept team-scoped models by their public name on POST /fallback
create_fallback validated the primary and fallback models against the
router's stored model names only, so a model created through POST
/model/new with model_info.team_id was rejected with a 404 unless the
caller used the generated model_name_<team_id>_<uuid> name. The
endpoint now also accepts the team public model names, which request
time fallback matching already keys on, and lists both kinds of names
in the 404's available_models.
* fix(proxy): read fallback rules fresh and clear the config cache after a fallback write
A second POST or DELETE /fallback within the 60 s config cache TTL started from
a cached copy of router_settings and dropped every rule stored since that copy
was taken, by any instance. Both endpoints now evict the cached row before the
read and invalidate it after the upsert
* test(proxy): type the fallback endpoint tests and prove a team request fails over by public name
* fix(proxy): keep fallback writes working when the Redis config cache is down and type the stored settings read
* fix(proxy): keep the non-standard fallback shapes the router accepts on writes and resolve the config cache at call time
* test(proxy): mark the config cache outage test's result as Final
* fix(proxy): replace a same-key fallback rule in place and read a null rule list as empty
* test(proxy): let the stored router settings fixture carry a null rule list
* test(proxy): audit cells for fallback rules by team public name
* test(proxy): delete the fallback rules the audit cells save
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Co-authored-by: mateo-berri <277851410+mateo-berri@users.noreply.github.com>
