chore: add bulk compare-at-price update script + restore middleware auth

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/api/admin/update-compare-prices/route.ts

@@ -0,0 +1,58 @@
+import { NextResponse } from 'next/server'
+import { readSheetProducts } from '@/lib/googleSheets'
+import { fetchAllShopifyProducts, getConfig } from '@/lib/shopifySync'
+
+export const maxDuration = 300
+
+export async function POST() {
+  const sheetProducts = await readSheetProducts()
+  const shopifyProducts = await fetchAllShopifyProducts()
+  const shopifyByHandle = new Map(shopifyProducts.map(p => [p.handle, p]))
+  const { baseUrl, headers } = getConfig()
+
+  const norm = (v: string | null | undefined) => (!v || v === '0.00') ? null : v
+
+  let updated = 0, skipped = 0, errors = 0
+  const log: string[] = []
+
+  for (const sheet of sheetProducts) {
+    const shopify = shopifyByHandle.get(sheet.handle)
+    if (!shopify) { skipped++; continue }
+
+    const newCompareAt = sheet.compareAtPrice ?? null
+    const currentCompareAt = (shopify as { compareAtPrice?: string }).compareAtPrice ?? null
+
+    if (norm(newCompareAt) === norm(currentCompareAt) && sheet.price === shopify.price) {
+      skipped++; continue
+    }
+
+    const detailRes = await fetch(`${baseUrl}/products/${shopify.shopifyId}.json?fields=variants`, { headers })
+    if (!detailRes.ok) { errors++; log.push(`✗ ${sheet.ref} — lecture variant`); continue }
+    const detail = await detailRes.json() as { product: { variants: Array<{ id: number }> } }
+    const variantId = detail.product.variants[0]?.id
+    if (!variantId) { errors++; continue }
+
+    const res = await fetch(`${baseUrl}/products/${shopify.shopifyId}.json`, {
+      method: 'PUT',
+      headers,
+      body: JSON.stringify({
+        product: {
+          id: shopify.shopifyId,
+          variants: [{ id: variantId, price: sheet.price, compare_at_price: newCompareAt }],
+        },
+      }),
+    })
+
+    if (res.ok) {
+      updated++
+      log.push(`✓ ${sheet.ref} price=${sheet.price} compare_at=${newCompareAt ?? 'null'}`)
+    } else {
+      errors++
+      log.push(`✗ ${sheet.ref} — ${res.status}`)
+    }
+
+    await new Promise(r => setTimeout(r, 300))
+  }
+
+  return NextResponse.json({ updated, skipped, errors, log })
+}