docs: update DAILY-FLOW.md for Phase 4 Forecasting

[w7-mgfcode]

Update next phase reference from PRP-3 (Ingest Layer) to PRP-5 (Forecasting) with scope summary.

Summary by Sourcery

Documentation:

• Document the Phase 4 Forecasting (PRP-5) workflow, branch naming, snapshot target, and high-level scope including model types, interfaces, and persistence approach.

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