v2.2.1: frontend closed-source + Docker one-click deploy

- Remove frontend source code (now in private repo)
- Add pre-built frontend/dist/ with Nginx serving
- Simplify docker-compose.yml (no Node.js build needed)
- Update README with docs index and Docker deploy guide
- Add admin order list and AI analysis stats tabs
- Add quick trade API routes
- Clean up redundant files (package-lock.json, yarn.lock, .iml)
- Add GitHub Actions workflow for frontend update automation

quantdinger_vue/src/api/login.js

@@ -1,59 +0,0 @@
-import request from '@/utils/request'
-
-const userApi = {
-  Login: '/api/auth/login',
-  Logout: '/api/auth/logout',
-  UserInfo: '/api/auth/info',
-  UserMenu: '/user/nav'
-}
-
-/**
- * login func
- * parameter: {
- *     username: '',
- *     password: '',
- *     remember_me: true,
- *     captcha: '12345'
- * }
- * @param parameter
- * @returns {*}
- */
-export function login (parameter) {
-  return request({
-    url: userApi.Login,
-    method: 'post',
-    data: parameter
-  })
-}
-
-export function getInfo () {
-  return request({
-    url: userApi.UserInfo,
-    method: 'get',
-    headers: {
-      'Content-Type': 'application/json;charset=UTF-8'
-    }
-  })
-}
-
-// Backward-compatible alias: some modules still call getUserInfo()
-export function getUserInfo () {
-  return getInfo()
-}
-
-export function logout () {
-  return request({
-    url: userApi.Logout,
-    method: 'post',
-    headers: {
-      'Content-Type': 'application/json;charset=UTF-8'
-    }
-  })
-}
-
-export function getCurrentUserNav () {
-  return request({
-    url: userApi.UserMenu,
-    method: 'get'
-  })
-}