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Implement inventory-based component selection logic that accumulates demand
across orders and falls back to sub-components (joint + element) when stock
is insufficient.
**Changes:**
- M04_Config: Add inventory worksheet configuration constants
- INVENTORY_SHEET_NAME = "现存量"
- INVENTORY_HEADER_ROW = 3 (headers on row 3)
- INVENTORY_COL_CODE = "B" (material code)
- INVENTORY_COL_QTY = "J" (stock quantity)
- M08_ComponentProcessor: Implement inventory tracking and verification
- Add module-level variables: g_InventoryDict, g_AccumulatedDemandDict
- Add LoadInventoryData() to load stock from [现存量] worksheet
- Add InitComponentProcessorWithInventory() for initialization with inventory
- Rewrite CheckComponentInventory() with actual inventory logic:
* Calculate cumulative demand = orderQty × bomQty + previousAccumulated
* Compare with available stock
* Return True if stock sufficient, False otherwise
* Update accumulated demand after each order
- Update ProcessComponentRecord() to accept orderQty parameter
- M09_BOMExtractor: Integrate inventory check into main workflow
- Modify ReadInputModels() to read 3 columns (orderNo, model, qty)
- Initialize component processor with inventory support
- Extract order quantity from column C and pass through call chain
- Update ProcessSingleModel() and MatchAllMaterialTypesWithValidation()
signatures to accept orderQty parameter
**Logic Example:**
- 3 orders (PO-001, PO-003, PO-006) use component A
- Each order: quantity=2, BOM qty=1, stock=5
- PO-001: cumulative=2, stock 5>=2 ✓ → return component
- PO-003: cumulative=4, stock 5>=4 ✓ → return component
- PO-006: cumulative=6, stock 5<6 ✗ → return sub-components
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>