feat: 项目初始化 + 3D方块世界原型 + AI助搭系统

初始化 monorepo: Go后端(7微服务) + Unity客户端(9模块) + 启动器

HTML5原型: Three.js 3D体素世界, Perlin噪声地形, 原版材质, 22种方块

Minecraft创造模式背包: 双栏布局, 拖拽移动物品, 方向性元件引脚

AI助搭策划文档 + 客户端/服务端骨架 + Docker Compose + CI

launcher/PCL-CE/.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,17 @@
+blank_issues_enabled: false
+contact_links:
+  - name: "旧版本优化反馈、新功能请求暂不受理 / Legacy Version Improvement Feedback and Feature Requests Are Not Accepted"
+    url: "https://github.com/PCL-Community/PCL-CE/issues/new/choose"
+    about: "由于开发重心已经转移到 C# 新版本，所以目前不计划再对旧版做优化和新功能了。/ Because development focus has shifted to the new C# version, we currently do not plan to optimize the legacy version or add new features to it. You can submit feature requests for the new version later."
+  - name: "新版本新功能请求暂不受理 / New Version Feature Requests Are Temporarily Not Accepted"
+    url: "https://github.com/PCL-Community/PCL-CE/issues/new/choose"
+    about: "由于 C# 新版本还不稳定，我们暂时不受理对新版本提出的新功能请求，请在晚一些时候再来。/ Because the new C# version is still unstable, we are temporarily not accepting feature requests for it. Please check back later."
+  - name: "主页预设反馈 / Homepage Preset Feedback"
+    url: https://github.com/Meloong-Git/PCL/discussions/categories/自定义主页
+    about: "提交与预设的主页（设置 → 个性化 → 主页预设）中的具体内容相关的反馈 / Submit feedback about specific content in homepage presets (Settings → Personalization → Homepage Presets)."
+  - name: "帮助文档反馈 / Help Documentation Feedback"
+    url: https://github.com/PCL-Community/docs.pclc.cc/issues
+    about: "提交与 PCL CE 帮助文档（独立文档站）中的具体内容相关的反馈 / Submit feedback about specific content in the PCL CE help documentation on the standalone documentation site."
+  - name: "提问 / 讨论 / Questions / Discussions"
+    url: https://github.com/PCL-Community/PCL-CE/discussions/new
+    about: "想问问或谈谈关于社区版的事情 / Ask questions or discuss topics about the Community Edition."