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.common.mts

@@ -0,0 +1,55 @@
+import { defineConfig } from "vite";
+import vue from "@vitejs/plugin-vue";
+import dotenv from "dotenv";
+import { loadAppConfig } from "./vite.config.utils.mts";
+import path from "path";
+import { fileURLToPath } from 'url';
+
+// Load environment variables
+dotenv.config();
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+export async function createBuildConfig(mode: string) {
+  const appConfig = await loadAppConfig();
+  const isElectron = mode === "electron";
+  const isCapacitor = mode === "capacitor";
+  const isPyWebView = mode === "pywebview";
+
+  if (isElectron || isPyWebView) {
+    process.env.VITE_PWA_ENABLED = 'false';
+  }
+
+  return {
+    base: isElectron || isPyWebView ? "./" : "/",
+    plugins: [vue()],
+    server: {
+      port: parseInt(process.env.VITE_PORT || "8080"),
+      fs: { strict: false },
+    },
+    build: {
+      outDir: isElectron ? "dist-electron" : "dist",
+      assetsDir: 'assets',
+      chunkSizeWarningLimit: 1000
+    },
+    define: {
+      'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV),
+      'process.env.VITE_PWA_ENABLED': JSON.stringify(!(isElectron || isPyWebView)),
+      __dirname: isElectron ? JSON.stringify(process.cwd()) : '""',
+    },
+    resolve: {
+      alias: appConfig.aliasConfig
+    },
+    optimizeDeps: {
+      exclude: isElectron ? [
+        'register-service-worker',
+        'workbox-window',
+        'web-push',
+        'serviceworker-webpack-plugin'
+      ] : []
+    }
+  };
+}
+
+export default defineConfig(async () => createBuildConfig('web'));