feat: 初始化高校人事请假考勤技能 (process-leave-attendance-default)

基于 skill-template 脚手架开发，包含：
- 5 张业务表（教职工、请假政策、考勤日历、请假记录、假期余额）
- 请假核算引擎（扣薪计算、审批层级判定、年假抵扣）
- CLI 入口（import-employees / calculate-leave / render-html）
- HTML 审批与扣薪报告生成
- 示例数据与完整测试套件（295 tests passed）

assets/examples/replaces-import.action.example.json

@@ -0,0 +1,38 @@
+{
+  "id": "item-import",
+  "label": "导入记录",
+  "description": "由宿主「导入数据」面板调用：解析 Excel/CSV 并写入业务表（含领域校验与派生字段）。",
+  "replaces": "import",
+  "placements": [],
+  "executionProfile": "sync",
+  "interaction": "form",
+  "bind": {
+    "tables": ["items"]
+  },
+  "hostEffects": {
+    "onSuccess": ["reloadTable"]
+  },
+  "inputSchema": {
+    "type": "object",
+    "required": ["filePath"],
+    "properties": {
+      "filePath": {
+        "type": "string",
+        "title": "导入文件",
+        "description": "由宿主导入面板传入的 Excel/CSV 路径。",
+        "format": "file"
+      },
+      "onError": {
+        "type": "string",
+        "title": "导入规则（出错时）",
+        "enum": ["跳过该行，继续导入", "立即停止，不再导入后续行"],
+        "default": "跳过该行，继续导入"
+      }
+    }
+  },
+  "entrypoint": {
+    "type": "cli",
+    "command": "item",
+    "args": ["import", "--file", "{{filePath}}", "--on-error", "{{onError}}"]
+  }
+}