[HYPERSHELL-135] feat(db): add deployment-backed gateway databases

[jhjaggars]

Summary

• default gateway database placement to a dedicated PostgreSQL Deployment while retaining explicit CNPG support
• make gateway database placement server-owned and harden provider validation, readiness, deletion tombstones, and cleanup retries
• add optional-CNPG Kind deployment paths, end-to-end coverage, and lifecycle specifications
• refresh generated API SDK artifacts after rebasing onto current main

CI follow-up

This branch addresses the failures observed on the earlier fork PR:

• regenerated OpenAPI/SDK artifacts to eliminate generated-code drift
• retains database_id in the web-console provisioning request, matching the existing Playwright expectation while allowing the API server to assign the real database

Validation

• make check
• cd components/control-plane && go test ./internal/reconciler ./internal/gateway ./internal/watcher
• cd components/api-server && make generate generate-sdk (clean working tree afterward)

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