feat(security): 新增域名所有权验证接口并更新安全配置

- 在SecurityConfig中允许访问新的验证文件路径 /MP_verify_joj96VBHPtL9YROj.txt
- 新增VerifyTxt2控制器，提供域名验证接口返回固定字符串
- 通过接口简化域名所有权验证流程，支持微信等平台验证需求

src/main/java/com/gxwebsoft/common/core/security/SecurityConfig.java

@@ -86,7 +86,8 @@ public class SecurityConfig extends WebSecurityConfigurerAdapter {
                         "/api/system/setting/getByKey/**",
                         "/api/system/setting/updateByKey/**",
                         "/lvQ4EoivKJ.txt",
-                        "/api/wechat-cert-test"
+                        "/api/wechat-cert-test",
+                        "/MP_verify_joj96VBHPtL9YROj.txt"
                   )
                 .permitAll()
                 .anyRequest()

src/main/java/com/gxwebsoft/common/system/controller/VerifyTxt2.java

@@ -0,0 +1,19 @@
+package com.gxwebsoft.common.system.controller;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@Tag(name = "安全")
+@RestController
+@RequestMapping("/MP_verify_joj96VBHPtL9YROj.txt")
+public class VerifyTxt2 {
+
+  @Operation(summary = "域名所有权验证")
+  @GetMapping()
+  public String verify(){
+    return "joj96VBHPtL9YROj";
+  }
+}