Renames the 10 P1-B tables (users, devices, cameras, zones, events,
event_snapshots, thresholds, nonces, rate_limits, audit_log) to a
move_ prefix so the schema can co-tenant a shared-hosting database.
- schema.sql + all App\Repository\Pdo\* queries + tests + deploy docs
- new migrations/2026-07-20-move-table-prefix.sql: atomic RENAME TABLE
for existing installs; must run BEFORE deploying this code
- index/constraint names left unchanged (no cross-table collision)
Tests: 109 pass, 4 skipped.
