[US-036] Bulk product import via CSV

[leimo2011]

User Story

As a store owner with a large catalog,
I want to import products in bulk via CSV,
So that I don't have to add each product manually.

Acceptance Criteria

• CSV template downloadable from dashboard
• CSV fields: name, description, price, category, SKU, stock_status, image_url
• Validation errors shown per row before import
• Successful import shows count of products added
• Failed rows downloadable as error report CSV

Estimate: 5 SP | Milestone: M2

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Epic: [EPIC-06] Product Catalog & Inventory