Add Shlink Web Client install and update support

Add optional Shlink Web Client installation and update workflow, switch init to use shlink-installer, and expose the web UI on port 3000. Changes include: use vendor/bin/shlink-installer init (sourcing /opt/shlink/.env) instead of direct db:migrate/create; create data directories (cache, locks, logs, proxies, temp-geolite); add interactive prompt to install the web client, fetch and deploy shlink-web-client GitHub releases, generate /opt/shlink-web-client/servers.json with the initial API key, and configure an nginx site serving the client on port 3000. The ct update script now also checks for and updates the web client release. Update metadata (json/shlink.json) to set interface_port to 3000 and add an info note about API (8080) vs Web Client (3000). Also print the 3000 URL on completion.

ct/shlink.sh

@@ -52,7 +52,10 @@ function update_script() {
     cd /opt/shlink
     $STD php ./vendor/bin/rr get --no-interaction --location bin/
     chmod +x bin/rr
-    $STD php bin/cli db:migrate --no-interaction
+    set -a
+    source /opt/shlink/.env
+    set +a
+    $STD php vendor/bin/shlink-installer init --no-interaction --clear-db-cache --skip-download-geolite
     msg_ok "Updated Application"
 
     msg_info "Starting Service"
@@ -60,6 +63,13 @@ function update_script() {
     msg_ok "Started Service"
     msg_ok "Updated successfully!"
   fi
+
+  if [[ -d /opt/shlink-web-client ]]; then
+    if check_for_gh_release "shlink-web-client" "shlinkio/shlink-web-client"; then
+      CLEAN_INSTALL=1 fetch_and_deploy_gh_release "shlink-web-client" "shlinkio/shlink-web-client" "prebuild" "latest" "/opt/shlink-web-client" "shlink-web-client_*_dist.zip"
+      msg_ok "Updated Web Client"
+    fi
+  fi
   exit
 }
 
@@ -71,3 +81,4 @@ msg_ok "Completed Successfully!\n"
 echo -e "${CREATING}${GN}${APP} setup has been successfully initialized!${CL}"
 echo -e "${INFO}${YW} Access it using the following URL:${CL}"
 echo -e "${TAB}${GATEWAY}${BGN}http://${IP}:8080${CL}"
+echo -e "${TAB}${GATEWAY}${BGN}http://${IP}:3000${CL}