fix container healthcheck false negative and register endpoints tables

curl --fail exited nonzero on the login probe's 400 before the body reached grep VALIDATION_ERROR, so the healthcheck always failed and the container reported unhealthy while the app was fine. Drop --fail so grep decides pass/fail. Also register endpoint tables in PLUGIN_TABLE_OWNERS so plugin migrations can resolve their owned metadata.

Dockerfile

@@ -92,7 +92,7 @@ USER shopdb
 EXPOSE 5001
 
 HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
-    CMD curl --fail --silent http://localhost:5001/api/auth/login -X POST \
+    CMD curl --silent http://localhost:5001/api/auth/login -X POST \
         -H "Content-Type: application/json" -d '{}' \
         | grep -q "VALIDATION_ERROR" || exit 1