feat(mobile): 区分移动端token存储键名并添加Playwright测试

修改mobile端token存储键名为'mobile_token'以区分不同客户端
添加Playwright测试套件用于知识库管理功能测试
更新.gitignore忽略node_modules和test-results目录

test/playwright.config.ts

@@ -0,0 +1,13 @@
+// playwright.config.js
+const { defineConfig } = require('@playwright/test');
+
+module.exports = defineConfig({
+    projects: [
+        {
+            name: 'chromium',
+            use: {
+                browserName: 'chromium',
+            },
+        },
+    ],
+});