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/3-feature.yml.disabled

@@ -0,0 +1,37 @@
+name: "[旧版] 新功能提案 / [Legacy] Feature Proposal"
+description: "对已有功能的大幅度修改，或添加一个新内容或选项。/ Propose a major change to an existing feature, or suggest a new feature or option."
+type: "新功能"
+body:
+  - type: checkboxes
+    id: "yml-1"
+    attributes:
+      label: "检查项 / Checklist"
+      description: "请逐个检查下列项目，并勾选确认 / Please review each item below and check the boxes to confirm."
+      options:
+        - label: "我已在 [Issues 页面](https://github.com/PCL-Community/PCL-CE/issues?q=is%3Aissue+) 中搜索，确认了这一提案未在社区版被提交过 / I have searched the [Issues page](https://github.com/PCL-Community/PCL-CE/issues?q=is%3Aissue+) and confirmed that this proposal has not been submitted to the Community Edition yet."
+          required: true
+        - label: "我确认只是全部选中而没有[仔细确认](https://github.com/PCL-Community/PCL-CE/issues?q=is%3Aissue+)就直接提交了这个 Issue，并且同意这个 Issue 可以直接被关闭 / I confirm that I checked all boxes without carefully reading them, and agree that this issue may be closed directly."
+          required: false
+        - label: "我确认我的提案是对某一个具体功能，而不是一堆功能要求挤在一个 Issue 里 / I confirm that this proposal focuses on a single specific feature, rather than multiple unrelated feature requests in one issue."
+          required: true
+        - label: "我已知悉本项目的开发者均为不带薪志愿者，社区不对这类 Issue 的完成时间作出任何保证，并有足够的耐心等待社区开发者的处理，同时已知悉如果我作出催促、质问或类似的举动，这个 Issue 可能会被直接关闭 / I understand that all developers of this project are unpaid volunteers. The community does not guarantee any completion time for this type of issue, and I am willing to wait patiently for the developers' review and handling. I also understand that excessive urging, demanding, or similar behavior may result in this issue being closed."
+          required: true
+  - type: textarea
+    id: "yml-2"
+    attributes:
+      label: "描述 / Description"
+      description: "详细描述你想添加的功能具体是怎样的 / Describe in detail the feature you would like to add."
+    validations:
+      required: true
+  - type: textarea
+    id: "yml-3"
+    attributes:
+      label: "原因 / Reason"
+      description: "详细描述你为什么需要这项功能，这有助于开发者评估它的优先度 / Explain why this feature is needed to help developers evaluate its priority."
+      placeholder: |
+        示例：
+        我需要这个功能来 xxxx，如果没有这个功能，就不能 xxxx 了。
+        Example:
+        I need this feature to xxxx. Without it, I would not be able to xxxx.
+    validations:
+      required: false