Can I vibe code OneStock?

Build a distributed order management system (OMS) microservice in TypeScript (Node.js/Fastify) with PostgreSQL and Redis. The system must aggregate inventory across multiple fulfillment locations (warehouses, physical stores, dropshippers) and route orders based on configurable rules.

Data Models:
- Location: id, code, type ('warehouse', 'store', 'vendor'), geo_lat, geo_lng, priority, max_daily_orders, active.
- InventoryLevel: id, location_id, sku, quantity_on_hand, quantity_allocated, quantity_reserved, safety_stock.
- Order: id, external_ref, status ('pending', 'routed', 'partially_fulfilled', 'fulfilled', 'cancelled'), customer_address (geo_lat, geo_lng), line_items (sku, qty, price).
- OrderFulfillmentGroup: id, order_id, location_id, status ('assigned', 'picking', 'packed', 'shipped'), line_items (sku, qty), carrier_code, tracking_number.
- RoutingRule: id, priority, condition_type ('nearest_location', 'minimize_splits', 'store_capacity', 'margin_maximizing'), configuration_json.

Core Features:
1. Inventory Reservation API: Implement atomic inventory reservation using Redis locks to prevent race conditions during high-concurrency order placement.
2. Order Routing Engine: Create an engine that evaluates incoming orders against enabled RoutingRules. Support multi-location order splitting if a single location cannot fulfill the complete order line items. Respect location max_daily_orders and safety_stock limits.
3. Mobile Pick & Pack Web Interface: Build a lightweight React PWA for store associates showing assigned OrderFulfillmentGroups. Include barcode scanning emulation, pick confirmation, item substitution handling, and partial fulfillment triggers.
4. Courier API Integration Interface: Define a plugin interface for carrier label generation (mocking DHL and FedEx label generation endpoints).

Out of Scope:
- In-store POS checkout hardware integrations.
- Payment gateway settlement processing.
- Full accounting/financial ledger modules.

Failure Modes to Handle:
- Concurrent physical stock decay (item sold in-store while associate is picking): system must handle pick-rejection and trigger automatic order re-routing to the next best location within 2 seconds.
- Inventory synchronization locks: use PostgreSQL transactional row locks (`FOR UPDATE`) when committing stock adjustments to prevent negative inventory values.

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