* ✨ Isolate backend-test database per devenv instance
Each wsN now gets its own backend-test database
(penpot_test_wsN) and Valkey DB (6+N) on the shared
infra, so parallel test runs no longer wipe each
other. The main database stays shared on purpose.
manage.sh creates the test database on bring-up and
passes PENPOT_TEST_* into the main container. Test
helpers already read those vars, so no runtime code
changes. scripts/psql and db-schema gain --ws.
AI-assisted-by: muse-spark-1.3-contributor-free
* 🐛 Fix per-instance test database creation on bring-up
psql -c does not reliably mix SQL with psql-only
commands, so the CREATE DATABASE ... WHERE NOT
EXISTS ... \gexec one-liner never ran. Use two
plain SQL round-trips instead (check pg_database,
then CREATE DATABASE) and print what happens, so a
future failure shows up in the bring-up output.
AI-assisted-by: muse-spark-1.3-contributor-free
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