fix: 修复CI构建失败 - 调整插件仓库顺序并恢复foojay-resolver

- pluginManagement中将gradlePluginPortal()/mavenCentral()移至阿里云镜像之前，
  防止镜像缺少de.undercouch.download插件导致构建失败
- 恢复被PR #1251误删的foojay-resolver-convention插件，
  项目使用jvmToolchain(21)需要此插件自动下载匹配JDK

settings.gradle

@@ -7,12 +7,15 @@ pluginManagement {
                 includeGroupByRegex("androidx.*")
             }
         }
-        maven { url 'https://maven.aliyun.com/repository/gradle-plugin' }
-        maven { url 'https://maven.aliyun.com/repository/public' }
         gradlePluginPortal()
         mavenCentral()
+        maven { url 'https://maven.aliyun.com/repository/gradle-plugin' }
+        maven { url 'https://maven.aliyun.com/repository/public' }
     }
 }
+plugins {
+    id 'org.gradle.toolchains.foojay-resolver-convention' version '1.0.0'
+}
 dependencyResolutionManagement {
     repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
     repositories {