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/samples/示例教职工.json

@@ -0,0 +1,49 @@
+{
+  "employees": [
+    {
+      "name": "张教授",
+      "employee_no": "T2015091",
+      "department": "数学学院",
+      "position": "副教授",
+      "position_category": "教师",
+      "join_date": "2015-09-01",
+      "monthly_salary": 12000,
+      "annual_leave_remaining": 5,
+      "is_active": 1,
+      "notes": "示例：病假核算（30天内全薪）"
+    },
+    {
+      "name": "李老师",
+      "employee_no": "T2018102",
+      "department": "物理学院",
+      "position": "讲师",
+      "position_category": "教师",
+      "join_date": "2018-09-01",
+      "monthly_salary": 9000,
+      "annual_leave_remaining": 7,
+      "is_active": 1
+    },
+    {
+      "name": "王主任",
+      "employee_no": "A2012033",
+      "department": "人事处",
+      "position": "科长",
+      "position_category": "行政",
+      "join_date": "2012-07-01",
+      "monthly_salary": 10000,
+      "annual_leave_remaining": 10,
+      "is_active": 1
+    },
+    {
+      "name": "赵研究员",
+      "employee_no": "R2019044",
+      "department": "材料所",
+      "position": "副研究员",
+      "position_category": "科研",
+      "join_date": "2019-03-01",
+      "monthly_salary": 11000,
+      "annual_leave_remaining": 6,
+      "is_active": 1
+    }
+  ]
+}