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.web.mts

@@ -0,0 +1,27 @@
+import { defineConfig, mergeConfig } from "vite";
+import { VitePWA } from "vite-plugin-pwa";
+import { createBuildConfig } from "./vite.config.common.mts";
+import { loadAppConfig } from "./vite.config.utils.mts";
+
+export default defineConfig(async () => {
+  const baseConfig = await createBuildConfig('web');
+  const appConfig = await loadAppConfig();
+
+  return mergeConfig(baseConfig, {
+    plugins: [
+      VitePWA({
+        registerType: 'autoUpdate',
+        manifest: appConfig.pwaConfig?.manifest,
+        devOptions: {
+          enabled: false
+        },
+        workbox: {
+          cleanupOutdatedCaches: true,
+          skipWaiting: true,
+          clientsClaim: true,
+          sourcemap: true
+        }
+      })
+    ]
+  });
+});