Add the core daily snapshot API that powers the dashboard. Returns:
- Training decision (status, reason, icon) using decision engine
- Cycle data (cycleDay, phase, phaseConfig, daysUntilNextPhase)
- Biometrics (hrvStatus, bodyBattery, weekIntensity, phaseLimit)
- Nutrition guidance (seeds, carbRange, ketoGuidance)
When no DailyLog exists (Garmin not synced), returns sensible defaults:
hrvStatus="Unknown", bodyBattery=100, weekIntensity=0. This allows
the app to function without Garmin integration.
22 tests covering auth, validation, all decision paths, override
handling, phase-specific logic, and nutrition guidance.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Petru Paler
949cb1671a