feat: complete HertzBeat 2.0 novice workflows
Refine entity, monitor, alert, settings, observability, and shared operator workflows; add scale guards, route compatibility, release validation, and Product Design coverage.
AI assistance: used for draft implementation and test iteration.\nHuman validation: Node 22 production build; 426 frontend files and 3,398 tests; 59-route matrix; release budget 7.84 MiB / 8.00 MiB; focused backend tests and Browser QA.\nRisk notes: local scale proof covers 2,005 entities; sustained concurrent-ingestion SLA remains deployment-specific.
Logic
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