chore: 升级构建配置到 Minecraft 26.1.2 / Java 25

- Loom 插件切换为 net.fabricmc.fabric-loom 1.18-SNAPSHOT & - Gradle wrapper 升级到 9.7.1 & - 依赖升级：loader 0.19.5 / fabric-api 0.155.3+26.1.2 / carpet 26.1+v260402 & - 编译目标 Java 25 & - CI 升级到 ubuntu-24.04 + JDK 25 + 新版 action

settings.gradle

@@ -7,4 +7,8 @@ pluginManagement {
         mavenCentral()
         gradlePluginPortal()
     }
-}
+
+    plugins {
+        id 'net.fabricmc.fabric-loom' version providers.gradleProperty("loom_version").get()
+    }
+}