feat: 增加开发模式 URL 免登录

- 新增 dev-only 且仅限本机访问的 admin 免登入口

- 管理端支持通过 ?devLogin=admin 自动换取登录态并清理 URL 参数

- 删除未受保护的临时 token 接口并补充关键单测

easyflow-ui-admin/app/src/router/dev-login.ts

@@ -0,0 +1,39 @@
+import type { LocationQuery, LocationQueryRaw } from 'vue-router';
+
+const DEV_LOGIN_ACCOUNT = 'admin';
+const DEV_LOGIN_QUERY_KEY = 'devLogin';
+
+function normalizeQueryValue(
+  value: LocationQuery[string] | LocationQueryRaw[string],
+) {
+  if (Array.isArray(value)) {
+    return value[0] ?? null;
+  }
+  return value ?? null;
+}
+
+export function getDevLoginAccount(query: LocationQuery | LocationQueryRaw) {
+  const value = normalizeQueryValue(query[DEV_LOGIN_QUERY_KEY]);
+  if (typeof value !== 'string') {
+    return null;
+  }
+  const account = value.trim();
+  return account.length > 0 ? account : null;
+}
+
+export function removeDevLoginQuery(query: LocationQuery | LocationQueryRaw) {
+  const { [DEV_LOGIN_QUERY_KEY]: _ignored, ...nextQuery } = query;
+  return nextQuery;
+}
+
+export function shouldAttemptDevLogin(params: {
+  account: null | string;
+  hasAccessToken: boolean;
+  isDev: boolean;
+}) {
+  return (
+    params.isDev &&
+    !params.hasAccessToken &&
+    params.account === DEV_LOGIN_ACCOUNT
+  );
+}