- Change cpu_cores from int to float64 in backend models, handlers, services
- Update frontend CreateInstancePage to accept decimal CPU values (step 0.1)
- Add DB migration 009_cpu_cores_decimal.sql for DECIMAL(10,2) columns
- Update deployment manifests (k8s, k3s, incluster) schema definitions
- Add GOFLAGS/GOPROXY/GOSUMDB build args to Dockerfile so that
--build-arg values passed by build scripts take effect during go mod download