chore(frontend): introduce prettier + eslint and prune unused code

- Add Prettier 3 with prettier-plugin-organize-imports (sorts/removes unused imports)
- Add ESLint 10 flat config with typescript-eslint + eslint-plugin-vue + eslint-config-prettier
- Add root scripts: format, format:check, lint, lint:fix
- Reformat 257 files across admin-web, ops-web, desktop-client, packages
- Remove unused locals/exports flagged by --noUnusedLocals/--noUnusedParameters
- Fix duplicate localTabLabel key, surrogate-pair regex u-flag, NBSP literal in regex
- Skip server/ (Go) and apps/browser-extension/ (deprecated per ADR)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/ops-web/vite.config.ts

@@ -1,70 +1,70 @@
-import { fileURLToPath, URL } from "node:url";
+import { fileURLToPath, URL } from 'node:url'
 
-import vue from "@vitejs/plugin-vue";
-import { defineConfig, loadEnv, type PluginOption } from "vite";
-import { compression } from "vite-plugin-compression2";
+import vue from '@vitejs/plugin-vue'
+import { defineConfig, loadEnv, type PluginOption } from 'vite'
+import { compression } from 'vite-plugin-compression2'
 
-const r = (path: string) => fileURLToPath(new URL(path, import.meta.url));
+const r = (path: string) => fileURLToPath(new URL(path, import.meta.url))
 
 export default defineConfig(({ mode }) => {
-  const env = loadEnv(mode, ".", "");
-  const isProd = mode === "production";
-  const plugins: PluginOption[] = [vue()];
+  const env = loadEnv(mode, '.', '')
+  const isProd = mode === 'production'
+  const plugins: PluginOption[] = [vue()]
 
   if (isProd) {
     plugins.push(
       compression({
-        algorithms: ["gzip", "brotliCompress"],
+        algorithms: ['gzip', 'brotliCompress'],
         threshold: 1024,
       }),
-    );
+    )
   }
 
   return {
     plugins,
     resolve: {
       alias: {
-        "@": r("./src"),
+        '@': r('./src'),
       },
     },
     server: {
-      host: "0.0.0.0",
+      host: '0.0.0.0',
       port: 5174,
       proxy: {
-        "/api": {
-          target: env.VITE_OPS_API_PROXY_TARGET || "http://localhost:8090",
+        '/api': {
+          target: env.VITE_OPS_API_PROXY_TARGET || 'http://localhost:8090',
           changeOrigin: true,
         },
       },
     },
-    esbuild: isProd ? { drop: ["console", "debugger"] } : undefined,
+    esbuild: isProd ? { drop: ['console', 'debugger'] } : undefined,
     build: {
-      target: "es2022",
-      sourcemap: "hidden",
+      target: 'es2022',
+      sourcemap: 'hidden',
       cssCodeSplit: true,
       reportCompressedSize: false,
       rollupOptions: {
         output: {
-          entryFileNames: "assets/js/[name]-[hash].js",
-          chunkFileNames: "assets/js/[name]-[hash].js",
-          assetFileNames: "assets/[name]-[hash][extname]",
+          entryFileNames: 'assets/js/[name]-[hash].js',
+          chunkFileNames: 'assets/js/[name]-[hash].js',
+          assetFileNames: 'assets/[name]-[hash][extname]',
           manualChunks(id) {
-            if (!id.includes("node_modules")) return undefined;
-            if (id.includes("/ant-design-vue/") || id.includes("/@ant-design/")) {
-              return "antd";
+            if (!id.includes('node_modules')) return undefined
+            if (id.includes('/ant-design-vue/') || id.includes('/@ant-design/')) {
+              return 'antd'
             }
             if (
-              id.includes("/vue/") ||
-              id.includes("/@vue/") ||
-              id.includes("/vue-router/") ||
-              id.includes("/pinia/")
+              id.includes('/vue/') ||
+              id.includes('/@vue/') ||
+              id.includes('/vue-router/') ||
+              id.includes('/pinia/')
             ) {
-              return "vue-vendor";
+              return 'vue-vendor'
             }
-            return "vendor";
+            return 'vendor'
           },
         },
       },
     },
-  };
-});
+  }
+})