feat: 前端生产构建添加代码混淆

- 集成 vite-plugin-javascript-obfuscator 插件
- 配置中等偏高强度混淆策略（变量名、字符串、对象键、数字）
- 仅生产构建时启用，不影响开发体验
- 仅混淆业务代码，排除第三方库
- 不生成 Source Map
- 新增 frontend-obfuscation 规范

frontend/vite.config.ts

@@ -1,5 +1,6 @@
 import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
+import obfuscatorPlugin from 'vite-plugin-javascript-obfuscator'
 import path from 'node:path'
 
 const vendorChunks: Record<string, string[]> = {
@@ -10,7 +11,42 @@ const vendorChunks: Record<string, string[]> = {
 
 // https://vite.dev/config/
 export default defineConfig({
-  plugins: [react()],
+  plugins: [
+    react(),
+    obfuscatorPlugin({
+      apply: 'build',
+      include: ['src/**/*.ts', 'src/**/*.tsx', 'src/**/*.js', 'src/**/*.jsx'],
+      exclude: [/node_modules/],
+      options: {
+        compact: true,
+        simplify: true,
+        identifierNamesGenerator: 'mangled-shuffled',
+        stringArray: true,
+        stringArrayCallsTransform: true,
+        stringArrayCallsTransformThreshold: 0.5,
+        stringArrayEncoding: ['base64'],
+        stringArrayIndexShift: true,
+        stringArrayRotate: true,
+        stringArrayShuffle: true,
+        stringArrayWrappersCount: 2,
+        stringArrayWrappersChainedCalls: true,
+        stringArrayThreshold: 0.75,
+        splitStrings: true,
+        splitStringsChunkLength: 10,
+        numbersToExpressions: true,
+        transformObjectKeys: true,
+        unicodeEscapeSequence: true,
+        debugProtection: true,
+        debugProtectionInterval: 2000,
+        disableConsoleOutput: true,
+        ignoreImports: true,
+        controlFlowFlattening: false,
+        deadCodeInjection: false,
+        selfDefending: false,
+        log: false,
+      },
+    }),
+  ],
   resolve: {
     alias: {
       '@': path.resolve(__dirname, './src'),
@@ -26,6 +62,7 @@ export default defineConfig({
   },
   build: {
     chunkSizeWarningLimit: 700,
+    sourcemap: false,
     rollupOptions: {
       output: {
         manualChunks(id) {