Add CI/CD pipelines, NSIS installer, ES module bundling, and ruff linting

- Add Gitea Actions workflows: test.yml (lint + test on push/PR) and
  release.yml (build + NSIS installer + upload on v* tags)
- Add NSIS installer with optional desktop shortcut and auto-start
- Add esbuild bundler: ES module migration with IIFE bundle output
- Add build-dist-windows.sh for cross-building Windows distribution
- Fix all ruff lint errors (import sorting, unused imports, line length)
- Remove redundant scripts (start-server.bat, stop-server.bat,
  start-server-background.vbs)
- Update CLAUDE.md with CI/CD and release documentation

media_server/static/js/callbacks.js

@@ -2,10 +2,13 @@
 // Callbacks: CRUD management
 // ============================================================
 
-let callbackFormDirty = false;
+import { t, showToast, escapeHtml, closeDialog, showConfirm } from './core.js';
+
+export let callbackFormDirty = false;
+export function setCallbackFormDirty(value) { callbackFormDirty = value; }
 
 let _loadCallbacksPromise = null;
-async function loadCallbacksTable() {
+export async function loadCallbacksTable() {
     if (_loadCallbacksPromise) return _loadCallbacksPromise;
     _loadCallbacksPromise = _loadCallbacksTableImpl();
     _loadCallbacksPromise.finally(() => { _loadCallbacksPromise = null; });
@@ -59,7 +62,7 @@ async function _loadCallbacksTableImpl() {
     }
 }
 
-function showAddCallbackDialog() {
+export function showAddCallbackDialog() {
     const dialog = document.getElementById('callbackDialog');
     const form = document.getElementById('callbackForm');
     const title = document.getElementById('callbackDialogTitle');
@@ -75,7 +78,7 @@ function showAddCallbackDialog() {
     dialog.showModal();
 }
 
-async function showEditCallbackDialog(callbackName) {
+export async function showEditCallbackDialog(callbackName) {
     const token = localStorage.getItem('media_server_token');
     const dialog = document.getElementById('callbackDialog');
     const title = document.getElementById('callbackDialogTitle');
@@ -115,7 +118,7 @@ async function showEditCallbackDialog(callbackName) {
     }
 }
 
-async function closeCallbackDialog() {
+export async function closeCallbackDialog() {
     if (callbackFormDirty) {
         if (!await showConfirm(t('callbacks.confirm.unsaved'))) {
             return;
@@ -128,7 +131,7 @@ async function closeCallbackDialog() {
     document.body.classList.remove('dialog-open');
 }
 
-async function saveCallback(event) {
+export async function saveCallback(event) {
     event.preventDefault();
 
     const submitBtn = event.target.querySelector('button[type="submit"]');
@@ -179,7 +182,7 @@ async function saveCallback(event) {
     }
 }
 
-async function deleteCallbackConfirm(callbackName) {
+export async function deleteCallbackConfirm(callbackName) {
     if (!await showConfirm(t('callbacks.confirm.delete').replace('{name}', callbackName))) {
         return;
     }