feat: 搭建后台管理端

- 初始化 Vue 3 + TypeScript + Vite 管理端工程

- 增加登录、租户、组织、用户、名片与系统页面

- 补充路由、状态管理、接口封装与基础样式体系

frontend_admin/package.json

@@ -0,0 +1,31 @@
+{
+  "name": "easycard-admin",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vue-tsc -b && vite build && rm -f dist.zip && cd dist && zip -rq ../dist.zip .",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@element-plus/icons-vue": "^2.3.1",
+    "axios": "^1.9.0",
+    "element-plus": "^2.9.11",
+    "pinia": "^3.0.3",
+    "sortablejs": "^1.15.7",
+    "vue": "^3.5.13",
+    "vue-router": "^4.5.1"
+  },
+  "devDependencies": {
+    "@tsconfig/node22": "^22.0.2",
+    "@types/node": "^24.0.3",
+    "@types/sortablejs": "^1.15.9",
+    "@vitejs/plugin-vue": "^5.2.4",
+    "@vue/tsconfig": "^0.7.0",
+    "sass": "^1.89.2",
+    "typescript": "~5.8.3",
+    "vite": "^6.3.5",
+    "vue-tsc": "^2.2.10"
+  }
+}