[codex] Split site API endpoint pool from panel host (#373)
* feat: add site api endpoint schema scaffolding * feat: wire site api endpoints into backup migration * feat: add site api endpoint selection service * feat: add site api endpoint contracts * feat: route discovery through site api endpoints * feat: route proxy traffic through site api endpoints * feat: add site api endpoint pool editor * fix: keep proxy video tasks on site endpoint pool * fix: restore core test compatibility for site endpoint pool * fix: address endpoint pool review findings
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