feat: kitchen screen, scan dedup, gemini-3.5-flash-lite, seed grapes/beetroot/pea shoots

apps/api/src/routes/scans.ts

@@ -150,6 +150,43 @@ export async function scanRoutes(app: FastifyInstance) {
       if (!locationId)
         throw errors.badRequest("storageLocationId saknas och ingen standardplats finns.");
 
+      // Dedup (#1): finns varan redan aktiv i hushållet? Uppdatera + hoppa över,
+      // så överlappande foton / omfotografering inte skapar dubletter.
+      const dedupCond = item.canonicalIngredientId
+        ? and(
+            eq(schema.inventoryItems.householdId, householdId),
+            eq(schema.inventoryItems.canonicalIngredientId, item.canonicalIngredientId),
+            gt(schema.inventoryItems.quantity, 0),
+          )
+        : and(
+            eq(schema.inventoryItems.householdId, householdId),
+            isNull(schema.inventoryItems.canonicalIngredientId),
+            eq(schema.inventoryItems.displayName, item.displayName),
+            gt(schema.inventoryItems.quantity, 0),
+          );
+      const [dupe] = await app.db
+        .select({ id: schema.inventoryItems.id })
+        .from(schema.inventoryItems)
+        .where(dedupCond)
+        .limit(1);
+      if (dupe) {
+        await app.db
+          .update(schema.inventoryItems)
+          .set({
+            quantity: item.quantity,
+            unit: item.unit,
+            brand: item.brand ?? null,
+            bestBeforeDate: item.bestBeforeDate ?? null,
+            useByDate: item.useByDate ?? null,
+            lastVerifiedAt: new Date(),
+            verifiedByUser: true,
+            updatedAt: new Date(),
+          })
+          .where(eq(schema.inventoryItems.id, dupe.id));
+        created.push(dupe.id);
+        continue;
+      }
+
       const [inv] = await app.db
         .insert(schema.inventoryItems)
         .values({