feat(products): support search_term on product index endpoint

## Context

The product catalog list in the app exposes a search box, and the
ProductsQuery already supports a search_term (ransacking name and code).
The REST index action did not forward it, so the endpoint could not be
filtered.

## Description

Pass params[:search_term] from the products index action to ProductsQuery,
matching the convention used by the other V1 index endpoints.

Author: rsempe

app/controllers/api/v1/products_controller.rb

@@ -49,6 +49,7 @@ def show
       def index
         result = ::ProductsQuery.call(
           organization: current_organization,
+          search_term: params[:search_term],
           pagination: {
             page: params[:page],
             limit: params[:per_page] || PER_PAGE

spec/requests/api/v1/products_controller_spec.rb

@@ -129,6 +129,26 @@
 
       expect(json[:products].map { it[:lago_id] }).not_to include(other.id)
     end
+
+    context "with a search term" do
+      subject { get_with_token(organization, "/api/v1/products?search_term=#{search_term}") }
+
+      let(:search_term) { "matching" }
+      let(:matching) { create(:product, organization:, name: "matching product") }
+      let(:other) { create(:product, organization:, name: "other product") }
+
+      before do
+        matching
+        other
+      end
+
+      it "returns only the products matching the search term" do
+        subject
+
+        expect(response).to have_http_status(:success)
+        expect(json[:products].map { it[:lago_id] }).to eq([matching.id])
+      end
+    end
   end
 
   describe "DELETE /api/v1/products/:code" do