fix(security): bump backend deps to close all 14 open Trivy code-scanning alerts (#869)

* fix(security): bump backend deps to close all open Trivy code-scanning alerts

- axios 1.16.0 -> 1.18.1 (GHSA-gcfj-64vw-6mp9 high + 10 medium advisories)
- sharp 0.34.3 -> 0.35.3 (GHSA-f88m-g3jw-g9cj, inherited libvips CVEs)
- mailparser 3.9.9 -> 3.9.14 (pulls linkify-it 5.0.2, CVE-2026-59887)
- brace-expansion override >=5.0.6 -> >=5.0.7 (CVE-2026-13149)
- body-parser 1.20.4 -> 1.20.6 via lockfile refresh (CVE-2026-12590)

* fix(images): migrate removed sharp failOnError option and enforce Node >=20.9

sharp 0.35 drops the deprecated failOnError constructor option, so
recoverably corrupt images would start failing upload validation and
thumbnail generation; use the failOn: 'none' equivalent instead.

sharp 0.35 also requires Node >=20.9: declare it in engines and make
picpeak-setup.sh compare the full version instead of only the major,
so native installs on Node 20.3-20.8 upgrade instead of breaking.

* fix(setup): align the Node floor with the whole dependency tree and gate native updates

html-to-text@10 needs Node >=20.19 and the glob/minimatch family excludes
Node 21, so declare engines as ^20.19.0 || >=22 and enforce the same range
in picpeak-setup.sh. Also run install_nodejs at the start of
update_native_installation so existing native installs on an old Node get
upgraded before the service is stopped, instead of restarting broken.

* fix(setup): make the update-path Node gate actually work

--update dispatches before detect_os, so install_nodejs saw an empty
PACKAGE_MANAGER, matched no install branch, and reported success on the
old runtime. Detect the OS on demand and re-verify the installed version
afterwards, failing loudly (before the service is stopped) when the
runtime still misses the engines range, e.g. a Node 21 that package
managers refuse to downgrade.

scripts/picpeak-setup.sh

@@ -15,6 +15,7 @@ readonly SCRIPT_VERSION="2.1.0"
 readonly APP_NAME="PicPeak"
 readonly REPO_URL="https://github.com/PicPeak/picpeak.git"
 readonly NODE_VERSION="20"
+readonly NODE_MIN_VERSION="20.19.0"  # backend engines: ^20.19.0 || >=22 (sharp 0.35, html-to-text 10)
 readonly MIN_RAM_DOCKER=2048
 readonly MIN_RAM_NATIVE=1024
 readonly MIN_DISK_GB=2
@@ -721,7 +722,15 @@ EOF
 ################################################################################
 
 install_nodejs() {
-    if command_exists node && [[ $(node -v | cut -d'v' -f2 | cut -d'.' -f1) -ge $NODE_VERSION ]]; then
+    # --update dispatches here before main() runs detect_os, so detect on demand
+    if [[ -z "$PACKAGE_MANAGER" ]]; then
+        detect_os
+    fi
+
+    local node_ver
+    node_ver=$(command_exists node && node -v | cut -d'v' -f2 || echo "0")
+    # backend engines range is ^20.19.0 || >=22 (Node 21 is excluded by the glob/minimatch family)
+    if [[ "$(printf '%s\n' "$NODE_MIN_VERSION" "$node_ver" | sort -V | head -1)" == "$NODE_MIN_VERSION" && "${node_ver%%.*}" != "21" ]]; then
         log_success "Node.js $(node -v) is already installed"
         return
     fi
@@ -738,7 +747,12 @@ install_nodejs() {
             $PACKAGE_MANAGER install -y nodejs
             ;;
     esac
-    
+
+    # Package managers won't downgrade a newer Node (e.g. 21), so re-verify before continuing
+    node_ver=$(command_exists node && node -v | cut -d'v' -f2 || echo "0")
+    if [[ "$(printf '%s\n' "$NODE_MIN_VERSION" "$node_ver" | sort -V | head -1)" != "$NODE_MIN_VERSION" || "${node_ver%%.*}" == "21" ]]; then
+        die "Node.js v$node_ver does not satisfy the backend requirement (^$NODE_MIN_VERSION || >=22); remove the current Node.js, install a supported version, then re-run this script"
+    fi
     log_success "Node.js installed: $(node -v)"
 }
 
@@ -1254,7 +1268,10 @@ update_docker_installation() {
 
 update_native_installation() {
     log_step "Updating native installation..."
-    
+
+    # Make sure the runtime satisfies the backend engines range before taking the service down
+    install_nodejs
+
     # Stop services
     systemctl stop picpeak-backend || true
     if systemctl list-unit-files | grep -q '^picpeak-workers.service'; then