Implements Phases 1 & 2 from proposal-inventory-lots-onboarding.md:
**Phase 1 - MVP (Inline Stock Entry):**
- Add stock lots immediately after creating ingredients
- Fields: quantity (required), expiration date, supplier, batch/lot number
- Smart validation with expiration date warnings
- Auto-select supplier if only one exists
- Optional but encouraged with clear skip option
- Help text about FIFO and waste prevention
**Phase 2 - Multi-Lot Support:**
- "Add Another Lot" functionality for multiple lots per ingredient
- Visual list of all lots added with expiration dates
- Delete individual lots before completing setup
- Lot count badge on ingredients with stock
**JTBD Alignment:**
- Addresses "Set up foundational data correctly" (lines 100-104)
- Reduces waste and inefficiency (lines 159-162)
- Enables real-time inventory tracking from day one (lines 173-178)
- Mitigates anxiety about complexity with optional, inline approach
**Technical Implementation:**
- Reuses existing useAddStock hook and StockCreate/StockResponse types
- Production stage defaulted to RAW_INGREDIENT
- Quality status defaulted to 'good'
- Local state management for added lots display
- Inline forms show contextually after each ingredient
Related: frontend/src/components/domain/setup-wizard/steps/InventorySetupStep.tsx:52-322
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