refactor: 移除 i18n 层级，将 zh 内容展开到根目录

- 删除 i18n/en/ 英文版本
- 将 i18n/zh/ 下的 documents/, prompts/, skills/, workflow/ 移至根目录
- 更新所有 i18n/zh/ 路径引用
- 更新 AGENTS.md 目录结构说明

workflow/canvas-dev/templates/module.canvas

@@ -0,0 +1,61 @@
+{
+  "nodes": [
+    {
+      "id": "module-main",
+      "type": "text",
+      "x": 0,
+      "y": 0,
+      "width": 280,
+      "height": 150,
+      "text": "# ModuleName\n\n## 职责\n- 功能描述1\n- 功能描述2\n\n## 公开接口\n- method1()\n- method2()"
+    },
+    {
+      "id": "module-dep1",
+      "type": "text",
+      "x": -350,
+      "y": 0,
+      "width": 200,
+      "height": 100,
+      "text": "# 依赖模块1\n\n被本模块调用",
+      "color": "3"
+    },
+    {
+      "id": "module-dep2",
+      "type": "text",
+      "x": 350,
+      "y": 0,
+      "width": 200,
+      "height": 100,
+      "text": "# 下游模块\n\n调用本模块",
+      "color": "5"
+    },
+    {
+      "id": "note-design",
+      "type": "text",
+      "x": 0,
+      "y": 200,
+      "width": 280,
+      "height": 100,
+      "text": "## 📝 设计决策\n\n- 为什么这样设计？\n- 有哪些权衡？",
+      "color": "6"
+    }
+  ],
+  "edges": [
+    {
+      "id": "edge-dep1",
+      "fromNode": "module-main",
+      "toNode": "module-dep1",
+      "fromSide": "left",
+      "toSide": "right",
+      "label": "调用"
+    },
+    {
+      "id": "edge-dep2",
+      "fromNode": "module-dep2",
+      "toNode": "module-main",
+      "fromSide": "left",
+      "toSide": "right",
+      "label": "调用"
+    }
+  ]
+}