Can I vibe code Crossborderit?

Build a Node.js and React administrative microservice for managing product HS (Harmonized System) code classifications and calculating basic landed costs at checkout.

1. DATA MODEL:
- Products: id, sku, title, base_price_usd, weight_kg, hs_code_6digit, country_of_origin
- TariffRules: destination_country_code, hs_code_6digit, duty_rate_percent, vat_rate_percent, de_minimis_threshold_usd
- LandedCostLogs: order_id, destination_country, subtotal_usd, duty_charged_usd, vat_charged_usd, total_ddp_usd, calculated_at

2. CORE FUNCTIONALITY:
- Create a REST API endpoint `/api/v1/calculate-landed-cost` that receives items array, shipping_cost, insurance_cost, and destination_country.
- For each item, look up the corresponding TariffRules by 6-digit HS code and destination country.
- Calculate CIF (Cost, Insurance, Freight) value.
- Check if CIF value exceeds destination de_minimis_threshold_usd. If below threshold, duty rate is 0%. If above, apply duty_rate_percent to (item_price + proportional_shipping).
- Apply vat_rate_percent to (CIF_value + duty_calculated).
- Return itemized response: { item_duties, item_vats, total_duty, total_vat, final_landed_cost }.
- Admin UI: A React table allowing store admins to search catalog SKUs, assign 6-digit HS codes, and edit default fallback duty rates per country.

3. FAILURE MODES & EDGE CASES:
- If an HS code is missing for an SKU, default to a fallback general tariff rate (e.g., 5% duty, local standard VAT rate) and flag order in LandedCostLogs.
- Handle currency conversion by maintaining a daily cached USD exchange rate table.
- Handle multi-item carts where items have different HS codes and duty rates correctly.

4. OUT OF SCOPE:
- Direct tax filing or IOSS remittance.
- Automated scraping of government tariff sites.
- Address validation or carrier shipping label generation.

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