refactor: reorganize Vite config into modular files

Split monolithic vite.config.mjs into separate config files:
- vite.config.web.mts
- vite.config.electron.mts
- vite.config.capacitor.mts
- vite.config.pywebview.mts
- vite.config.common.mts
- vite.config.utils.mts

Updates:
- Modify package.json scripts to use specific config files
- Add electron-builder as dev dependency
- Update electron build configuration
- Fix electron resource paths
- Remove old vite.config.mjs and utils.js

This change improves maintainability by:
- Separating concerns for different build targets
- Making build configurations more explicit
- Reducing complexity in individual config files

vite.config.electron.mts

@@ -0,0 +1,29 @@
+import { defineConfig, mergeConfig } from "vite";
+import { createBuildConfig } from "./vite.config.common.mts";
+
+export default defineConfig(async () => {
+  const baseConfig = await createBuildConfig('electron');
+  
+  return mergeConfig(baseConfig, {
+    plugins: [{
+      name: 'remove-sw-imports',
+      transform(code: string, id: string) {
+        if (
+          id.includes('registerServiceWorker') ||
+          id.includes('register-service-worker') ||
+          id.includes('sw_scripts') ||
+          id.includes('PushNotificationPermission') ||
+          code.includes('navigator.serviceWorker')
+        ) {
+          return {
+            code: code
+              .replace(/import.*registerServiceWorker.*$/mg, '')
+              .replace(/import.*register-service-worker.*$/mg, '')
+              .replace(/navigator\.serviceWorker/g, 'undefined')
+              .replace(/if\s*\([^)]*serviceWorker[^)]*\)\s*{[^}]*}/g, '')
+          };
+        }
+      }
+    }]
+  });
+});