refactor: frontend TS migration + Tailwind4/daisyUI5 unify + BUILDPLATFORM docker build

- migrate frontend to TypeScript (vue-tsc strict in build), upgrade all deps to latest (Vite 8, Tailwind 4, daisyUI 5, Pinia 4, vue-router 5)
- restructure frontend dirs (api/components/common/layouts/styles/types/views)
- drop Element Plus, add daisyUI TagInput; main CSS 490KB->163KB, entry JS 618KB->1.3KB
- rewrite Dockerfile(.cn): frontend/backend stages pinned to $BUILDPLATFORM, CGO_ENABLED=0 cross-compile, no QEMU in multi-arch builds; add .dockerignore
- local dev: Vite /api proxy + make dev targets; go:embed all:dist with .gitkeep so backend runs without prior frontend build
- fix latent bugs: Keys.vue users ref, Settings.vue undefined userStore, Login.vue Ref-as-error display, res.error misuse
- add REFACTOR_PLAN.md (phased refactor log)

frontend/vite.config.ts

@@ -0,0 +1,55 @@
+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+import tailwindcss from '@tailwindcss/vite'
+import basicSsl from '@vitejs/plugin-basic-ssl'; // 推荐使用这个插件简化自签名证书管理
+
+import path from 'path'
+
+// 本地开发默认走 HTTP（localhost 属于安全上下文，clipboard/passkey 均可用）；
+// 需要自签名 HTTPS 时设置 VITE_DEV_HTTPS=true
+const useHttps = process.env.VITE_DEV_HTTPS === 'true'
+// 后端地址：默认 make dev-backend 启动的 8080，可用 VITE_DEV_API_TARGET 覆盖
+const apiTarget = process.env.VITE_DEV_API_TARGET || 'http://localhost:8080'
+
+// https://vite.dev/config/
+export default defineConfig({
+  plugins: [vue(), tailwindcss(), ...(useHttps ? [basicSsl()] : [])],
+  server: {
+    https: useHttps ? {} : undefined,
+    host: 'localhost', // 确保 host 是 localhost
+    port: 5173,
+    proxy: {
+      // 前端 axios baseURL 为 /api，开发时代理到本地 Go 后端，免去跨域与重建
+      '/api': {
+        target: apiTarget,
+        changeOrigin: true,
+      },
+    },
+  },
+  resolve: {
+    alias: {
+      '@': path.resolve(import.meta.dirname, 'src'),
+    },
+  },
+  build: {
+    // sourcemap: true,
+    chunkSizeWarningLimit: 1000,
+    rollupOptions: {
+      output: {
+        manualChunks(id) {
+          if (id.includes('src/components')) {
+              return 'components';
+          }
+
+          if (id.includes('src/views/dashboard')) {
+            return 'views-dashboard'
+          }
+
+          if (id.includes('src/stores')) {
+            return 'stores';
+          }
+        }
+      }
+    }
+  },
+});