chore: 修正构建配置以支持本机 JDK 25 构建

- 移除 toolchain 约束，改用 options.release = 21 兼容 Halo API
- 通过 gradle.properties 指定本机 JDK 25 路径
- gradle wrapper 切换至腾讯镜像源解决下载超时

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

gradle/wrapper/gradle-wrapper.properties

@@ -1,7 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.0-bin.zip
-networkTimeout=10000
-validateDistributionUrl=true
+distributionUrl=https\://mirrors.cloud.tencent.com/gradle/gradle-9.4.0-bin.zip
+networkTimeout=30000
+validateDistributionUrl=false
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists