feat: extract cms from mp/cms — initial libreshop/cms

Source moved verbatim from mp/cms/ on 2026-04-29; mp was the first
concrete adapter consuming the libreshop toolkit. Builds and publishes
git.librete.ch/libreshop/cms on every main / v* push via the standard
.gitea/workflows/build.yml shared across libreshop components.

tests/stress-test-generate-invoice.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+BEARER='b5739bfdb5267e51533de07dc3726aecfa8063fd5fe3d903bdef7d9f614cd99e5ee8fe227587edb29df6be2a2bf8849cd713d1e8a82b3ff2d27244a10deb849559d573e4662de0ad5844e32afbfed5f82b22d7cbd57a01b5fcc7ca251abf0bf2a5d2a050745d81f0c47a9358d58f0f9b44b66d8649f7e9f5df10b9a2fcce58bd'
+
+
+# Function to run a single curl command
+run_curl() {
+    curl --request PUT \
+        --url 'https://localhost:8443/api/order/a00ad9d9-fa7b-4989-a37c-5ef5051325fe/generate-delivery-note' \
+        --header "Authorization: Bearer ${BEARER}" \
+        --header 'content-type: application/json' \
+        --header 'cache-control: no-cache' \
+        --header 'pragma: no-cache' \
+        --compressed \
+        --output /dev/null \
+        --insecure -s -o /dev/null -w '%{time_total}s\n'
+}
+
+# Number of parallel jobs to run
+NUM_JOBS=5
+
+# Number of requests per job
+NUM_REQUESTS=100
+
+# Function to run a batch of requests
+run_batch() {
+    for i in $(seq 1 $NUM_REQUESTS); do
+        run_curl
+    done
+}
+
+# Run the stress test using background jobs
+for i in $(seq 1 $NUM_JOBS); do
+    run_batch &
+done
+
+# Wait for all background jobs to finish
+wait
+
+echo "Stress test completed."