9085 Poolside Laguna Model Ids - Omniroute

feat(providers): publish Poolside's Laguna Preview catalog statically — poolside/laguna-xs-2.1 and poolside/laguna-s-2.1 (262144 context, 32768 max completion, tools + reasoning, text-only), so the models are routable and visible before a key is configured instead of only after live discovery. Pins the catalog form of the XS id against the laguna-xs.2 variant carried by third-party listings. (#9085)