Add the store package (pgx-backed repository) with CRUD for the core resources
the compiler needs: fabrics, zones, address groups, portgroups, devices,
bindings, rules, policies. Every mutation bumps a global config generation.
Wire real JSON CRUD handlers with token auth, source/dest grammar validation on
rule create, and the agent status-report endpoint. Migration 0001 verified
against Postgres 17.
benvin