fix(inventory-opt): inventory optimization: pagination, queries, filters for 10k+ products

work/artifacts/INVENTORY-OPT/reviewer.json

@@ -0,0 +1,29 @@
+{
+  "feature_id": "INVENTORY-OPT",
+  "agent": "reviewer",
+  "stage": "review_gate",
+  "verdict": "APPROVED",
+  "checks": [
+    {
+      "item": "Admin inventory no longer performs N+1 product/variant/stock/price fetches and now reads a single paginated backend overview endpoint",
+      "ok": true
+    },
+    {
+      "item": "Server-side query supports search by product name, SKU and EAN plus the existing stock/expiry/low-margin filters",
+      "ok": true
+    },
+    {
+      "item": "Admin UI preserves inline stock/EAN/expiry editing while moving pagination and filtering to the server",
+      "ok": true
+    },
+    {
+      "item": "Changed files validated by backend typecheck/build, admin build, verify.sh and a real PostgreSQL integration test for the overview endpoint",
+      "ok": true
+    }
+  ],
+  "issues": [],
+  "notes": [
+    "The endpoint is variant-based, which matches inventory reality better than the old first-variant-per-product approximation.",
+    "Admin build still emits unrelated existing Turbopack warnings about dynamic uploads filesystem access; not introduced by this feature."
+  ]
+}